CHAPTER 3 DOMESTIC ELECTRICITY

Size: px
Start display at page:

Download "CHAPTER 3 DOMESTIC ELECTRICITY"

Transcription

1 CHAPTER 3 DOMESTIC ELECTRICITY 1 Electrical Power How to calculate power drawn from a source? Three equivalent expressions of power [HKCEE] [Power] Calculate the power dissipated in the 10Ω resistor. Page 1

2 [HKCEE] [Power] A resistor and a bulb are connected in parallel to a 9 V battery as shown above. The reading of the ammeter is5 A. If the power dissipated by the resistor is 18 W, find the power dissipated by the bulb. [HKCEE] [Power] Three identical light bulbs are connected to a cell as shown in the diagram. After some time, the filament ofbulb Z breaks. What will happen to the brightness of the remaining light bulbs? High voltage transmission of electricity Why electricity generated must be transmitted using very high voltage? Page 2

3 [HKCEE] [Power transmission] Which of the following statements about long distance power transmission at high alternating voltages arecorrect? (1) Alternating voltages can be stepped up or down efficiently by transformers. (2) For a given transmission power, the current will be reduced if a high voltage is adopted. (3) The power loss in the transmission cables will be reduced if a high voltage is adopted. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) [HKCEE] [Power transmission] 100 kw of electrical power is transmitted at 20 kv through cables of total resistance 4 Ω. Find the potentialdrop and power loss in the cables. 2 Power Rating Rated Value: The meaning of 220V, 60W Page 3

4 [HKCEE][Rated value] Three light bulbs P, Q and R of ratings 24 V, 80 W, 12 V, 80 W and 12 V, 40 W respectively are connectedin parallel to a 12 V battery. Which of the bulbs will be the brightness, and which will be dimmest? [HKCEE][Rated value] Two light bulbs A and B of ratings 10 W, 6 V and 5 W, 6 V respectively are connected in series to a 6Vbattery. Which of the following statements is/are correct? (1) The resistance of A is smaller than that of B. (2) The current through A is the same as that through B. (3) A is brighter than B. A. (1) only B. (3) only C. (1) and (2) only D. (2) and (3) only E. (1), (2) and (3) Page 4

5 [HKCEE][Rated value] The above diagram shows the label attached to a rice cooker. Which of the following statements is/are truewhen the cooker is working at its rated value? (1) The resistance of the cooker is 96.8 Ω (2) The cooker draws a current of 4.4 A from the mains supply (3) The cooker consumes 1 kw h of the electrical energy in 2 hours. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only E. (1), (2) and (3) [HKCEE][Electricity Cost] The following table shows three electrical appliances which Clara used in a certain month: Calculate the cost of electricity used. Note: 1 kw h of electricity costs $ Page 5

6 [Further question: Why common induction cookers usually have maximum output power 2800W?] 3 Household wiring Alternating Current vs Direct Current Page 6

7 Three wires and plug Why the earth pin is slightly longer than the other two pins? Fuse Why the fuse and switch must be installed in the live wire but not the neutral wire? Page 7

8 [Plug][HKCEE] The diagram above shows a three-pin plug and the wires connecting to it. To which of the pins should each ofthe wires X, Y and Z be connected? [Plug][HKCEE] The photograph shows a three-pin plug of an appliance. Which of the following is a function of pin P? A. It prevents the appliance from being short-circuited. B. It protects the user from getting an electric shock. C. It provides a return path for the current. D. It can break the circuit when the current flowing through the appliance is too large. [Wiring][HKCEE] Which of the following diagrams correctly shows the connection of the wires of an iron to the pins of a plug?(l : Live, N : Neutral, E : Earth) Page 8

9 [Wiring][HKCEE] The switch S and the fuse of an iron are incorrectly fitted in the neutral wire as shown above. Which of thefollowing statements is correct? A. The iron will not operate even when S is on. B. The iron will still operate even when S is off. C. The iron will still operate, but if there is high current the fuse will not blow. D. The iron will still operate, but if the live wire accidentally touches the body of the iron the current cannotbe conducted to the earth. E. The iron will still operate, but the heating element will remain at a high potential even when S is off. [Fuse][HKCEE] If a 15 A fuse is installed in the plug of an electric kettle of rating 220 V, 900 W, which of the followingdescriptions is correct? A. The kettle will not operate. B. The kettle will be short-circuited. C. The output power of the kettle will be increased. D. The chance of the kettle being damaged by an excessive current will be increased. Household wiring plan Page 9

10 Lighting circuit two way switch Ring main [Circuit Breaker][HKCEE] A household circuit breaker is marked 220 V, 15 A. Now an iron rated 220 V, 1100 W and a cooker rated 220 V, 550 W are connected in parallel to the mains socket. How many light bulbs rated 220 V, 100 W atmost can be connected in parallel to the mains without triggering the circuit breaker? A. 12 B. 16 C. 17 D. 20 FINAL REMARKS The understanding of electrical power and household wiring is of great importance in our daily life. For academic purpose, students should know the calculation of power and understand the design of household circuit. For practical purpose, students should know how household electricity is being supplied, through all the circuit components, and be able to utilize household electricity. Page 10

Chapter 21 Practical Electricity

Chapter 21 Practical Electricity Chapter 21 Practical Electricity (A) Electrical Power 1. State four applications of the heating effect of electricity. Home: o Used in electric kettles o Used in electric irons o Used in water heaters

More information

7J Electrical circuits Multiple-choice main test

7J Electrical circuits Multiple-choice main test For each question, circle the correct answer. Question 1 A switch turns off a torch by... A) breaking the circuit B) making the circuit C) shorting the circuit D) turning a series circuit into a parallel

More information

INTERACTIVE SCIENCE 2A

INTERACTIVE SCIENCE 2A INTERACTIVE SCIENCE 2A Workbook Solutions (Enrichment Edition) Chapter 8 MAKING USE OF ELECTRICITY Part A Sectional Exercise 8.1 & 8.2 Concept checking p.35 1. False 2. True 3. False 4. True 5. True Questions

More information

Electrical Energy and Power Ratings

Electrical Energy and Power Ratings Section 1 - From the Wall Socket Electrical Energy and ower Ratings Batteries and the mains are sources of electrical energy. Electrical appliances can then convert this into other forms of energy. e.g.

More information

ELECTRICITY & MAGNETISM - EXAMINATION QUESTIONS (4)

ELECTRICITY & MAGNETISM - EXAMINATION QUESTIONS (4) ELECTRICITY & MAGNETISM - EXAMINATION QUESTIONS (4) 1. Which two electrical quantities are measured in volts? A current and e.m.f. B current and resistance C e.m.f. and potential difference D potential

More information

CHAPTER 6.3: CURRENT ELECTRICITY

CHAPTER 6.3: CURRENT ELECTRICITY CHAPTER 6.3: CURRENT ELECTRICITY These components are used in electric circuits. TASK: Draw how you could make this lamp light. Electricity will only flow through a complete circuit. The battery, wires

More information

Class X Chapter 09 Electrical Power and Household circuits Physics

Class X Chapter 09 Electrical Power and Household circuits Physics EXERCISE- 9 (A) Question 1: Write an expression for the electrical energy spent in flow of current through an electrical appliance in terms of current, resistance and time. Solution 1: Electrical energy,

More information

High Demand Questions QUESTIONSHEET 1 (a) Teresa set up the circuit shown in the diagram. The ammeter reading was 0.4 A.

High Demand Questions QUESTIONSHEET 1 (a) Teresa set up the circuit shown in the diagram. The ammeter reading was 0.4 A. High Demand Questions QUESTIONSHEET 1 (a) Teresa set up the circuit shown in the diagram. The ammeter reading was 0.4 A. A 4 Ω (i) What is the value of the current through the 4Ω resistor? (ii) What is

More information

Electrical Circuits W.S.

Electrical Circuits W.S. Electrical Circuits W.S. 1. In the circuit shown at the right, a voltage of 6 V pushes charge through a single resistor of 2 W. According to Ohm's law, the current in the resistor, and therefore in the

More information

Lab 4. DC Circuits II

Lab 4. DC Circuits II Physics 2020, Spring 2005 Lab 4 page 1 of 7 Lab 4. DC Circuits II INTRODUCTION: This week we will continue with DC circuits, but now with an emphasis on current rather than voltage. Of course, in order

More information

Circuits-Circuit Analysis

Circuits-Circuit Analysis Base your answers to questions 1 through 3 on the information and diagram below. 4. A 9-volt battery is connected to a 4-ohm resistor and a 5-ohm resistor as shown in the diagram below. A 3.0-ohm resistor,

More information

PAPER 2 THEORY QUESTIONS

PAPER 2 THEORY QUESTIONS PAPER 2 THEORY QUESTIONS 1 A plastic rod is rubbed with a cloth and becomes negatively charged. (a) Explain how the rod becomes negatively charged when rubbed with a cloth... [2] (b) An uncharged metal-coated

More information

The graphs show the voltage across two different types of cell as they transfer the last bit of their stored energy through the torch bulb.

The graphs show the voltage across two different types of cell as they transfer the last bit of their stored energy through the torch bulb. Q1. A small torch uses a single cell to make the bulb light up. (a) The graphs show the voltage across two different types of cell as they transfer the last bit of their stored energy through the torch

More information

Electrical power. Objectives. Assessment. Assessment. Equations. Physics terms 5/27/14

Electrical power. Objectives. Assessment. Assessment. Equations. Physics terms 5/27/14 Electrical power Objectives Use the equation for electrical power to solve circuit problems. Understand basic concepts for home electricity usage and wiring. Calculate the power used by electric circuit

More information

CHAPTER 2 ELECTRIC CIRCUIT

CHAPTER 2 ELECTRIC CIRCUIT CHAPTE 2 ELECTIC CICUIT 1 Electric charges Two kinds of charges Who carry those charges? Unit of charge 2 Flow of charge and electric current The true picture of a circuit Page 1 The conventional picture

More information

Chapter 26 DC Circuits

Chapter 26 DC Circuits Chapter 26 DC Circuits Electric circuit needs battery or generator to produce current these are called sources of emf. Battery is a nearly constant voltage source, but does have a small internal resistance,

More information

Lab 4. DC Circuits II

Lab 4. DC Circuits II Physics 2020, Spring 2005 Lab 4 page 1 of 7 Lab 4. DC Circuits II INTRODUCTION: This week we will continue with DC circuits, but now with an emphasis on current rather than voltage. Of course, in order

More information

Chapter 26 DC Circuits. Copyright 2009 Pearson Education, Inc.

Chapter 26 DC Circuits. Copyright 2009 Pearson Education, Inc. Chapter 26 DC Circuits 26-1 EMF and Terminal Voltage Electric circuit needs battery or generator to produce current these are called sources of emf. Battery is a nearly constant voltage source, but does

More information

JSUNIL TUTORIAL PUNJABI COLONY GALI 01

JSUNIL TUTORIAL PUNJABI COLONY GALI 01 10 th Electricity Numerical 1. The current passing through a room heater has been halved. What will happen to the heat produced by it? 2. An electric iron of resistance 20 ohm draws a current of 5 amperes.

More information

Which of the following statements is/are correct about the circuit above?

Which of the following statements is/are correct about the circuit above? Name: ( ) Class: Date: Electricity Exercises 1. Which of the following statements is/are correct about the circuit above? (1) Electrons flow from right to left through the bulb A. (2) Charges will be used

More information

Current, resistance and potential difference

Current, resistance and potential difference Multiple choice questions 1. Three conductors join as shown in the diagram. The direction of the current in each conductor is shown by the arrow. Y Z X The current in the conductor Z is 10 A. The current

More information

ELECTRIC POWER AND HOUSEHOLD CIRCUITS

ELECTRIC POWER AND HOUSEHOLD CIRCUITS ELECTRIC POWER AND HOUSEHOLD CIRCUITS HEATING EFFECT OF CURRENT Heating effect of electricity is one of the widely-used effects in the world. When electric current is passed through a conductor, it generates

More information

2: The resistivity of copper is Ω.m. Determine the resistance of a copper wire that is 1.3 m long and has a diameter of 2.1 mm.

2: The resistivity of copper is Ω.m. Determine the resistance of a copper wire that is 1.3 m long and has a diameter of 2.1 mm. Chapter 20 Discussion January-03-15 8:58 PM Electric Circuits Discussion Questions 1: A current of 12 A flows for 2.5 minutes to charge a battery. How much charge is transferred to the battery in this

More information

Series and Parallel Circuits

Series and Parallel Circuits Series and Parallel Circuits 1 of 23 Boardworks Ltd 2016 Series and Parallel Circuits 2 of 23 Boardworks Ltd 2016 What are series and parallel circuits? 3 of 23 Boardworks Ltd 2016 Circuit components can

More information

PHYSICS 6 EXTENDED PHYSICS

PHYSICS 6 EXTENDED PHYSICS PHYSICS 6 EXTENDED PHYSICS GRADE 11 TERM 3 PORTFOLIO TASKS 2013-2014 STS\G11\Portfolio\Extended Physics Assessment Booklet\CDAU\ADVETIVersion 1.0 2014 1 31 Unit/Topic Performance Criteria Assess Event

More information

PURE PHYSICS ELECTRICITY & MAGNETISM (PART I)

PURE PHYSICS ELECTRICITY & MAGNETISM (PART I) PURE PHYSICS ELECTRICITY & MAGNETISM (PART I) 1 A student walks across a thick carpet and becomes positively charged as his shoes rub on the carpet. When he touches the metal handle of a door, negative

More information

Electricity 2 Questions NAT 5

Electricity 2 Questions NAT 5 Electricity 2 Questions NAT 5 1) a) A 25W lamp is designed to be used with the mains voltage. Calculate the resistance of the lamp. b) Four of the lamps are connected in parallel. Calculate the total resistance

More information

7.9.2 Potential Difference

7.9.2 Potential Difference 7.9.2 Potential Difference 62 minutes 69 marks Page 1 of 20 Q1. A set of Christmas tree lights is made from twenty identical lamps connected in series. (a) Each lamp is designed to take a current of 0.25

More information

Using Electricity. Summary Notes. 1. From the Wall Socket Household appliances. Earth wire and safety.

Using Electricity. Summary Notes. 1. From the Wall Socket Household appliances. Earth wire and safety. Using Electricity Summary Notes Section Content 1. From the Wall Socket Household appliances. Earth wire and safety. 2. Alternating and Direct Battery and transformer. Current Circuit diagrams. Current

More information

Physics - Chapters Task List

Physics - Chapters Task List Name Hour Physics - Chapters 34-35 Task List Task In Class? (Yes/No) Date Due Grade Lab 33.1 - Wet Cell Battery Yes */15 * Vodcast #1 Electric Circuits & Ohm s Law /21 Worksheet Concept Review #1-12, Ch

More information

Name: Base your answer to the question on the information below and on your knowledge of physics.

Name: Base your answer to the question on the information below and on your knowledge of physics. Name: Figure 1 Base your answer to the question on the information below and on your knowledge of physics. A student constructed a series circuit consisting of a 12.0-volt battery, a 10.0-ohm lamp, and

More information

(2) The graph below shows how the power output of a wind turbine changes over one day.

(2) The graph below shows how the power output of a wind turbine changes over one day. Energy resources can be renewable or non-renewable. (a) Coal is a non-renewable energy resource. Name two other non-renewable energy resources... 2.. (b) Wind turbines are used to generate electricity.

More information

PHYSICS MCQ (TERM-1) BOARD PAPERS

PHYSICS MCQ (TERM-1) BOARD PAPERS GRADE: 10 PHYSICS MCQ (TERM-1) BOARD PAPERS 1 The number of division in ammeter of range 2A is 10 and voltmeter of range 5 V is 20. When the switch of the circuit given below is closed, ammeter reading

More information

Electricity Notes 3. Objectives

Electricity Notes 3. Objectives Electricity Notes 3 Objectives Series Circuit There is only one path for the current to travel. bulbs connected in series; when one goes out, they all go out. As you add more bulbs, the brightness of the

More information

to allow a current in one circuit to operate a switch in another circuit to protect a circuit by melting if the current becomes too large

to allow a current in one circuit to operate a switch in another circuit to protect a circuit by melting if the current becomes too large 1 What is the function of a relay? to allow a current in one circuit to operate a switch in another circuit to prevent an electric shock by earthing a metal case to protect a circuit by melting if the

More information

Name: Paisley Grammar Physics Department UNIT 2 USING ELECTRICITY PUPIL PACK. National 4/5 Physics. Study Guides Summary Notes Homework Sheets

Name: Paisley Grammar Physics Department UNIT 2 USING ELECTRICITY PUPIL PACK. National 4/5 Physics. Study Guides Summary Notes Homework Sheets Name: National 4/5 Physics Paisley Grammar Physics Department UNIT 2 USING ELECTRICITY PUPIL PACK Study Guides Summary Notes Homework Sheets USING ELECTRICITY Working at Home TO THE PUPIL Each day you

More information

2. Four 20-Ω resistors are connected in parallel and the combination is connected to a 20- V emf device. The current in any one of the resistors is:

2. Four 20-Ω resistors are connected in parallel and the combination is connected to a 20- V emf device. The current in any one of the resistors is: University Physics (Prof. David Flory) Chapt_27 Sunday, February 03, 2008 Page 1 Name: Date: 1. By using only two resistors, R1 and R2, a student is able to obtain resistances of 3 Ω, 4 Ω, 12 Ω, and 16

More information

Chapter Assessment Use with Chapter 22.

Chapter Assessment Use with Chapter 22. Date Period 22 Use with Chapter 22. Current Electricity Understanding Concepts Part A Use each of the following terms once to complete the statements below. ampere electric current potential difference

More information

Ordinary Level Physics SOLUTIONS: EFFECTS OF AN ELECTRIC CURRENT

Ordinary Level Physics SOLUTIONS: EFFECTS OF AN ELECTRIC CURRENT Ordinary Level Physics SOLUTIONS: EFFECTS OF AN ELECTRIC CURRENT Safety Features and kilowatt hours The unit of energy is called the kilowatt hour One kilowatt hour is the amount of energy used by a 1000

More information

Current Electricity. 3 rd Years

Current Electricity. 3 rd Years Current Electricity 3 rd Years Comparing: Flow of electricity to flow of water. Electric Current An electric current is a flow of electric charge. An electric current is caused by the flow of electrons

More information

SPS10. Students will investigate the properties of electricity and magnetism.

SPS10. Students will investigate the properties of electricity and magnetism. ELECTRICITY SPS10. Students will investigate the properties of electricity and magnetism. a. Investigate static electricity in terms of Friction Induction Conduction b. Explain the flow of electrons in

More information

Circuit Notes. Def: 1. Power supply:

Circuit Notes. Def: 1. Power supply: Circuit Notes Def: Parts of a circuit 1. Power supply: Types: 1- photovoltaic cell: generates current when exposed to light. ex: solar calculator or watch. 2- Batteries and generators. 2. Wires: 3. Switch

More information

Electricity Unit Review

Electricity Unit Review Science 9 Electricity Unit Review Name: General Definitions: Neutral Object Charge Separation Electrical Discharge Electric Current Amperes (amps) Voltage (volts) Voltmeter Ammeters Galvanometer Multimeter

More information

Circuits. What are circuits?

Circuits. What are circuits? Circuits Circuits What are circuits? A closed loop made of a conducting substance that allows electrons to flow from the negative terminal to the positive terminal Parts of a Circuit 1 Power Supply Provides

More information

Current Score: 0/20. Due: Mon Feb :15 PM EST. Question Points. 0/40/100/40/10/1 Total 0/20. Description

Current Score: 0/20. Due: Mon Feb :15 PM EST. Question Points. 0/40/100/40/10/1 Total 0/20. Description 1 of 5 2/4/2010 3:35 PM Current Score: 0/20 Due: Mon Feb 15 2010 10:15 PM EST Question Points 1 2 3 4 5 0/40/100/40/10/1 Total 0/20 Description This assignment is worth 20 points. Each part is worth 1

More information

Review for formula, circuit and resistance test

Review for formula, circuit and resistance test Review for formula, circuit and resistance test 1. Fill in the table giving the symbol and unit(s) for each. Current intensity Potential difference Voltage Resistance Power Energy Time 2. Give the formula

More information

ELECTRICIAN S THEORY EXAMINATION 11 September 2010 QUESTION AND ANSWER BOOKLET

ELECTRICIAN S THEORY EXAMINATION 11 September 2010 QUESTION AND ANSWER BOOKLET Candidate Code No. ET36 For Board Use Only Result Date Int Result Date Int ELECTRICIAN S THEORY EXAMINATION 11 September 2010 QUESTION AND ANSWER BOOKLET INSTRUCTIONS READ CAREFULLY Time Allowed: Three

More information

Year 11 GCSE PHYSICS REVISION QUESTIONS PAPER 1. Higher Level. Energy and Electricity

Year 11 GCSE PHYSICS REVISION QUESTIONS PAPER 1. Higher Level. Energy and Electricity Year 11 GCSE PHYSICS REVISION QUESTIONS PAPER 1 Higher Level Energy and Electricity Moulsham High School 1 1. A domestic electricity bill for the Smith family is shown. The unit of electricity is the kilowatt

More information

16.3 Ohm s Law / Energy and Power / Electric Meters

16.3 Ohm s Law / Energy and Power / Electric Meters 16.3 Ohm s Law / Energy and Power / Electric Meters Voltage Within a battery, a chemical reaction occurs that transfers electrons from one terminal to another terminal. This potential difference across

More information

Boardworks Ltd Mains Electricity

Boardworks Ltd Mains Electricity 1 of 22 Boardworks Ltd 2016 Mains Electricity Mains Electricity 2 of 22 Boardworks Ltd 2016 Direct current 3 of 22 Boardworks Ltd 2016 There are two main types of electric current: direct current (DC)

More information

1. Which of these shows the correct units for both energy and power? A kilowatt joule B joule kilojoule C kilojoule watt D watt kilowatt

1. Which of these shows the correct units for both energy and power? A kilowatt joule B joule kilojoule C kilojoule watt D watt kilowatt Multiple choice 1. Which of these shows the correct units for both energy and power? Energy Power A kilowatt joule B joule kilojoule C kilojoule watt D watt kilowatt 2. Which of these could cause an electrical

More information

Electrical Power Electric power electrical electric power Electric power electric electric

Electrical Power Electric power electrical electric power Electric power electric electric Power Calculations Electrical Power Electric power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Electric power is

More information

Cabrillo College Physics 10L. LAB 7 Circuits. Read Hewitt Chapter 23

Cabrillo College Physics 10L. LAB 7 Circuits. Read Hewitt Chapter 23 Cabrillo College Physics 10L Name LAB 7 Circuits Read Hewitt Chapter 23 What to learn and explore Every electrical circuit must have at least one source (which supplies electrical energy to the circuit)

More information

PhysicsAndMathsTutor.com 1

PhysicsAndMathsTutor.com 1 Q1. A battery of emf 9.0 V and internal resistance, r, is connected in the circuit shown in the figure below. (a) The current in the battery is 1.0 A. (i) Calculate the pd between points A and B in the

More information

A direct current (DC) circuit. L 26 Electricity and Magnetism [4] Alternating Current (AC) Direct Current DC. AC power

A direct current (DC) circuit. L 26 Electricity and Magnetism [4] Alternating Current (AC) Direct Current DC. AC power L 26 Electricity and Magnetism [4] A direct current (DC) circuit simple electrical circuits direct current DC Alternating current (AC) vs direct current (DC) electric power distribution household electricity

More information

7. How long must a 100-watt light bulb be used in order to dissipate 1,000 joules of electrical energy? 1) 10 s 3) 1,000 s 2) 100 s 4) 100,000 s

7. How long must a 100-watt light bulb be used in order to dissipate 1,000 joules of electrical energy? 1) 10 s 3) 1,000 s 2) 100 s 4) 100,000 s 1. Which quantity must be the same for each component in any series circuit? 1) power 3) current 2) resistance 4) voltage 2. A student needs a 4-ohm resistor to complete a circuit. Only a large quantity

More information

Write the term that correctly completes the statement. Use each term once. ampere. electric current. resistor battery.

Write the term that correctly completes the statement. Use each term once. ampere. electric current. resistor battery. Date Period Name CHAPTER 22 Study Guide Current Electricity Vocabulary Review Write the term that correctly completes the statement. Use each term once. ampere electric current resistor battery kilowatt-hour

More information

4 Electricity and Magnetism

4 Electricity and Magnetism 4 Electricity and Magnetism 1. Simple phenomena of magnetism 2. Electrical quantities 3. Electrical circuits 4. Dangers of electricity 5. Electromagnetic effects 6. Cathode ray oscilloscope 1. The diagram

More information

Chapter 19: DC Circuits

Chapter 19: DC Circuits Chapter 19: DC Circuits EMF and Terminal Voltage Resistors in Series and in Parallel Kirchhoff s Rules EMFs in Series and in Parallel; Charging a Battery Capacitors in Series and in Parallel RC Circuits

More information

INVESTIGATION ONE: WHAT DOES A VOLTMETER DO? How Are Values of Circuit Variables Measured?

INVESTIGATION ONE: WHAT DOES A VOLTMETER DO? How Are Values of Circuit Variables Measured? How Are Values of Circuit Variables Measured? INTRODUCTION People who use electric circuits for practical purposes often need to measure quantitative values of electric pressure difference and flow rate

More information

How is lightning similar to getting an electric shock when you reach for a metal door knob?

How is lightning similar to getting an electric shock when you reach for a metal door knob? How is lightning similar to getting an electric shock when you reach for a metal door knob? Electricity Electric charges are from protons, which are positive (+) and electrons, which are negative (-).

More information

NATIONAL CERTIFICATE (VOCATIONAL) ELECTRICAL SYSTEMS AND CONSTRUCTION NQF LEVEL 2 NOVEMBER 2009

NATIONAL CERTIFICATE (VOCATIONAL) ELECTRICAL SYSTEMS AND CONSTRUCTION NQF LEVEL 2 NOVEMBER 2009 NATIONAL CERTIFICATE (VOCATIONAL) ELECTRICAL SYSTEMS AND CONSTRUCTION NQF LEVEL 2 NOVEMBER 2009 (12041032) 12 November (X-Paper) 09:00 12:00 This question paper consists of 6 pages. (12041032) -2- NC710(E)(N12)V

More information

Circuit Analysis Questions A level standard

Circuit Analysis Questions A level standard 1. (a) set of decorative lights consists of a string of lamps. Each lamp is rated at 5.0 V, 0.40 W and is connected in series to a 230 V supply. Calculate the number of lamps in the set, so that each lamp

More information

Science Olympiad Shock Value ~ Basic Circuits and Schematics

Science Olympiad Shock Value ~ Basic Circuits and Schematics Science Olympiad Shock Value ~ Basic Circuits and Schematics Use a single D battery, a single bare wire and a light bulb. Find four different ways to light the light bulb using only a battery, one wire

More information

HOW IS ELECTRICITY PRODUCED?

HOW IS ELECTRICITY PRODUCED? ELECTRICITY HOW IS ELECTRICITY PRODUCED? All electricity is produced from other sources of energy. Hydroelectricity is produced from the stored energy of water held back by a dam. As the water runs downhill

More information

CLASSIFIED 5 MAGNETISM ELECTROMAGNETIC INDUCTION GENERATOR MOTOR - TRANSFORMER. Mr. Hussam Samir

CLASSIFIED 5 MAGNETISM ELECTROMAGNETIC INDUCTION GENERATOR MOTOR - TRANSFORMER. Mr. Hussam Samir CLASSIFIED 5 MAGNETISM ELECTROMAGNETIC INDUCTION GENERATOR MOTOR - TRANSFORMER Mr. Hussam Samir EXAMINATION QUESTIONS (5) 1. A wire perpendicular to the page carries an electric current in a direction

More information

Magnetic Effects of Electric Current

Magnetic Effects of Electric Current Magnetic Effects of Electric Current Question 1: Why does a compass needle get deflected when brought near a bar magnet? Answer: A compass needle is a small bar magnet. When it is brought near a bar magnet,

More information

Question 2: Around the bar magnet draw its magnetic fields. Answer:

Question 2: Around the bar magnet draw its magnetic fields. Answer: Chapter 13: Magnetic Effects of Electric Current Question 1: What is the reason behind the compass needle is deflected when it is brought close to the bar magnet? Compass needles work as a small bar magnet;

More information

Electromagnetic Induction

Electromagnetic Induction Electromagnetic Induction Question Paper Level ubject Exam oard Unit Topic ooklet O Level Physics ambridge International Examinations Electricity and Magnetism Electromagnetic Induction Question Paper

More information

SC10F Circuits Lab Name:

SC10F Circuits Lab Name: SC10F Circuits Lab Name: Purpose: In this lab you will be making, both, series and parallel circuits. You will then be using a millimeter to take readings at various points in these circuits. Using these

More information

AP Physics B Ch 18 and 19 Ohm's Law and Circuits

AP Physics B Ch 18 and 19 Ohm's Law and Circuits Name: Period: Date: AP Physics B Ch 18 and 19 Ohm's Law and Circuits MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A device that produces electricity

More information

Unit 3 Lesson 3 Electric Circuits. Copyright Houghton Mifflin Harcourt Publishing Company

Unit 3 Lesson 3 Electric Circuits. Copyright Houghton Mifflin Harcourt Publishing Company A Complete Circuit What are the parts of an electric circuit? An electric circuit is a complete, closed path through which electric charges can flow. All electric circuits contain three basic parts: an

More information

Unit 9. (Filled In) Draw schematic circuit diagrams for resistors in series and in parallel

Unit 9. (Filled In) Draw schematic circuit diagrams for resistors in series and in parallel Name: Date: Period: Unit 9 Series & Parallel Circuits (Filled In) Essential Questions: Does adding resistors to a circuit always reduce current? Does adding more light bulbs to a circuit always make them

More information

Using Electricity. Prepared in Jan 1999 Second editing in March 2000

Using Electricity. Prepared in Jan 1999 Second editing in March 2000 Using Electricity Prepared in Jan 1999 Second editing in March 2000 Learning objectives At the end of this unit you should be able to : 1. show understanding of the use of fuses and fuse rating. 2. give

More information

ELECTRICAL SERVICE TECHNICIAN EXAMINATION 25 November 2017 QUESTION AND ANSWER BOOKLET

ELECTRICAL SERVICE TECHNICIAN EXAMINATION 25 November 2017 QUESTION AND ANSWER BOOKLET Candidate Code No. EST 2075 For Board Use Only Result Date Int Result Date Int ELECTRICAL SERVICE TECHNICIAN EXAMINATION 25 November 2017 QUESTION AND ANSWER BOOKLET INSTRUCTIONS READ CAREFULLY Time Allowed:

More information

Electric Circuits Lab

Electric Circuits Lab Electric Circuits Lab Purpose: To construct series and parallel circuits To compare the current, voltage, and resistance in series and parallel circuits To draw schematic (circuit) diagrams of various

More information

Page 1 of 19. Website: Mobile:

Page 1 of 19. Website:     Mobile: Question 1: Why does a compass needle get deflected when brought near a bar magnet? A compass needle is a small bar magnet. When it is brought near a bar magnet, its magnetic field lines interact with

More information

Intext Exercise 1 Question 1: Why does a compass needle get deflected when brought near a bar magnet?

Intext Exercise 1 Question 1: Why does a compass needle get deflected when brought near a bar magnet? Intext Exercise 1 Why does a compass needle get deflected when brought near a bar magnet? A compass needle is a small bar magnet. When it is brought near a bar magnet, its magnetic field lines interact

More information

ELECTRICIAN S THEORY EXAMINATION 19 June 2010 QUESTION AND ANSWER BOOKLET

ELECTRICIAN S THEORY EXAMINATION 19 June 2010 QUESTION AND ANSWER BOOKLET Candidate Code No. ET34 For Board Use Only Result Date Int Result Date Int ELECTRICIAN S THEORY EXAMINATION 19 June 2010 QUESTION AND ANSWER BOOKLET INSTRUCTIONS READ CAREFULLY Time Allowed: Three hours

More information

Series circuits. The ammeter

Series circuits. The ammeter Series circuits D o you remember how the parts of the torch on pages 272 3 were connected together? The circuit contained several components, connected one after the other. Conductors, like the metal strip

More information

9. Effects of an electric current

9. Effects of an electric current Leaving Cert Physics Long Questions 2017-2002 9. Effects of an electric current Please remember to photocopy 4 pages onto one sheet by going A3 A4 and using back to back on the photocopier Contents Ordinary

More information

Unit P.2, P2.3. Currents in electric circuits E ½. F Fuel gauge indicator. Fuel tank. Ammeter. Float. Battery. Sliding contact. Pivot 12V.

Unit P.2, P2.3. Currents in electric circuits E ½. F Fuel gauge indicator. Fuel tank. Ammeter. Float. Battery. Sliding contact. Pivot 12V. Currents in electric circuits 1. The diagram shows the fuel gauge assembly in a car. The sliding contact touches a coil of wire and moves over it. The sliding contact and the coil form a variable resistor.

More information

Electrical Circuits Discussion Questions:

Electrical Circuits Discussion Questions: Electrical Circuits Discussion Questions: 1) What is electricity? 2) How does an electrical circuit work? 3) What types of materials conduct electrical energy? 4) How is electrical energy measured? 5)

More information

Electrical Workplace Safety

Electrical Workplace Safety Electrical Workplace Safety Alan Kelly 23 rd September 2015 Objectives To provide an understanding of Electrical terms and the concepts of electricity To introduce Electrical Protective Devices and provide

More information

Parts of an atom. Protons (P + ) Electrons (e - ) Neutrons. Have a positive electric charge. Have a negative electric charge

Parts of an atom. Protons (P + ) Electrons (e - ) Neutrons. Have a positive electric charge. Have a negative electric charge Electricity Parts of an atom Protons (P + ) Have a positive electric charge Electrons (e - ) Have a negative electric charge Neutrons Are neutral Have no charge Electric Charge In most atoms, the charges

More information

Calculate the current in the kettle element. (3)

Calculate the current in the kettle element. (3) 1 (a) A man monitors how much money he spends on electricity. He uses a device which calculates the cost of electrical energy used. He connects his 2.9 kw electric kettle to the 230 V mains supply. (i)

More information

A direct current (DC) circuit. Alternating Current (AC) Direct Current DC. AC current. L 27 Electricity and Magnetism [4]

A direct current (DC) circuit. Alternating Current (AC) Direct Current DC. AC current. L 27 Electricity and Magnetism [4] L 27 Electricity and Magnetism [4] A direct current (DC) circuit simple electrical circuits direct current DC Alternating current (AC) vs direct current (DC) electric power distribution household electricity

More information

More Complex Circuit

More Complex Circuit Series and Parallel Circuits Circuits usually include three components. One is a source of voltage difference that can be provided by a battery or an electrical outlet. Another is one or more devices that

More information

4 Electric Circuits. TAKE A LOOK 2. Identify Below each switch, label the circuit as a closed circuit or an open circuit.

4 Electric Circuits. TAKE A LOOK 2. Identify Below each switch, label the circuit as a closed circuit or an open circuit. CHAPTER 1 4 Electric Circuits SECTION Introduction to Electricity BEFORE YOU READ After you read this section, you should be able to answer these questions: What are the three main parts of a circuit?

More information

4.2 Electrical Quantities

4.2 Electrical Quantities For more awesome GSE and level resources, visit us at www.savemyexams.co.uk/ 4.2 Electrical Quantities Question Paper Level IGSE Subject Physics (625) Exam oard Topic Sub Topic ooklet ambridge International

More information

34.5 Electric Current: Ohm s Law OHM, OHM ON THE RANGE. Purpose. Required Equipment and Supplies. Discussion. Procedure

34.5 Electric Current: Ohm s Law OHM, OHM ON THE RANGE. Purpose. Required Equipment and Supplies. Discussion. Procedure Name Period Date CONCEPTUAL PHYSICS Experiment 34.5 Electric : Ohm s Law OHM, OHM ON THE RANGE Thanx to Dean Baird Purpose In this experiment, you will arrange a simple circuit involving a power source

More information

What is included in a circuit diagram?

What is included in a circuit diagram? Circuit Diagrams What is included in a circuit diagram? Circuit diagrams use symbols to represent parts of a circuit, including a source of electrical energy and devices that are run by the electrical

More information

Chapter 28. Direct Current Circuits

Chapter 28. Direct Current Circuits Chapter 28 Direct Current Circuits Direct Current When the current in a circuit has a constant magnitude and direction, the current is called direct current Because the potential difference between the

More information

L E A R N I N G O U T C O M E S

L E A R N I N G O U T C O M E S L E A R N I N G O U T C O M E S What is charge? How does a charge form? Electricity What is an electric current? Y E A R 1 0 C H A P T E R 1 2 What are conductors, insulators and semiconductors? How does

More information

ELECTRICAL APPLIANCE SERVICEPERSON (QUALIFIED) EXAMINATION

ELECTRICAL APPLIANCE SERVICEPERSON (QUALIFIED) EXAMINATION 23 June 2018 Time Allowed: 2 Hours ELECTRICAL APPLIANCE SERVICEPERSON (QUALIFIED) EXAMINATION Check the label on the back of this paper to ensure you have your paper. INSTRUCTIONS READ CAREFULLY You have

More information

12.7 Power in Electric Circuits

12.7 Power in Electric Circuits 1.7 1.7 Power in Electric Circuits To predict the amount of energy used by an electrical device, such as a radio, stove, lights, or television, we first need to know the amount of time the device will

More information

Student Exploration: Advanced Circuits

Student Exploration: Advanced Circuits Name: Date: Student Exploration: Advanced Circuits [Note to teachers and students: This Gizmo was designed as a follow-up to the Circuits Gizmo. We recommend doing that activity before trying this one.]

More information

Exam-style questions: electricity

Exam-style questions: electricity Exam-style questions: electricity Q. The diagram shows an electrical circuit. (a) Complete the two labels on the diagram. P and Q are meters. What is meter P measuring?... () What is meter Q measuring?...

More information

4 Electric Circuits. TAKE A LOOK 2. Identify Below each switch, label the circuit as a closed circuit or an open circuit.

4 Electric Circuits. TAKE A LOOK 2. Identify Below each switch, label the circuit as a closed circuit or an open circuit. CHAPTER 17 4 Electric Circuits SECTION Introduction to Electricity BEFORE YOU READ After you read this section, you should be able to answer these questions: What are the three main parts of a circuit?

More information

15 Electrical Circuits Name Worksheet A: SERIES CIRCUIT PROBLEMS

15 Electrical Circuits Name Worksheet A: SERIES CIRCUIT PROBLEMS Worksheet A: SERIES CIRCUIT PROBLEMS be careful to use proper significant figures on all answers 1. What would be the required voltage of an energy source in a circuit with a current of 10.0 A and a resistance

More information