INTERACTIVE SCIENCE 2A
|
|
- Barnaby Foster
- 5 years ago
- Views:
Transcription
1 INTERACTIVE SCIENCE 2A Workbook Solutions (Enrichment Edition) Chapter 8 MAKING USE OF ELECTRICITY Part A Sectional Exercise 8.1 & 8.2 Concept checking p False 2. True 3. False 4. True 5. True Questions p (a) will not do not form (b) will not do not form a closed circuit (c) will the bulb, the dry cells and the wires form a closed circuit (d) will the bulb, the dry cells and the wires form a closed circuit (e) will not no electricity supply 2. (a) (i) C (ii) C (iii) I (iv) I (b) (i) C (ii) C (iii) I (iv) I 3. Substance Electrical conductor Electrical insulator (a) Glass (b) Iron nail (c) Wood (d) Mercury (e) Plastic (f) Paper (g) Stone (h) Silver 4. No. In fact, the tram, the wire, the copper rail and the power supply form a closed circuit. 8.1
2 When the positive and negative terminals of the power supply are connected to the wire and the copper rail respectively, electricity flows through the wire to the tram and leaves the tram through the copper rail. (or other reasonable answers) 8.3 & 8.4 Fill in the blanks p (a) ampere (b) volt 2. free electrons (a) dry cell (b) wire (c) free electrons 5. (a) ammeter (b) voltmeter 6. battery 7. larger Questions p (a) (b) Connect one more dry cell to the circuit. The two dry cells should be connected together with their positive poles pointing to the same direction. (or other reasonable answers) (c) (or other reasonable answers) (d) The reading of the ammeter connected in the circuit in (c) is higher. This is because the voltage supplied by two dry cells is higher than that supplied by only one dry 8.2
3 2. (a) cell, so the electric current flowing through that circuit is larger. (or other reasonable answers) (b) The reading of the voltmeter is 1.5 V. (c) (d) The reading of the voltmeter is 3 V. (e) The bulb in (c) in brighter. 8.5 Multiple choice p C 2. D 3. C 4. A Fill in the blanks p ohm 2. smaller 3. higher 4. higher 5. rheostat Questions p Measure the resistance of the bulb with the multimeter. If the measured resistance is infinitely large, the filament is broken. 2. (a) 8.3
4 (electric current can be opposite to that shown above) (b) Turn the rotating contact in anti-clockwise direction. (c) Terminals B and C (d) Turn the rotating contact in clockwise direction. (e) Dimmers in a lighting system or volume controls on hi-fi systems (or other reasonable answers) 8.6 Multiple choice p B 2. C 3. C Questions p (a) Dry cell (b) Battery (c) Bulb (d) Ammeter (e) Voltmeter (f) Resistor (g) Rheostat (h) Switch 2. (a) (b) 8.4
5 (c) (d) (e) 8.7 Concept checking p True 2. True 3. False 4. False 5. False 6. True Multiple choice p A 2. A 3. B 4. B Questions p (a) series 8.5
6 (b) series (c) parallel (d) series (e) parallel (f) parallel (g) series 2. (a) (or other reasonable answers) (b) Dry cells, switch, resistor, rheostat and ammeter (c) Voltmeter and resistor (d) Move the sliding contact towards Q. (Answer depends on how the wires are connected in (a).) (e) Connect one more dry cell to the circuit. The two dry cells should be connected with their positive poles pointing to the same direction./replace the resistor with another one with a lower resistance. (or other reasonable answers) 8.8 Concept checking p True 2. True 3. False 4. False 5. True 6. False Multiple choice p B 2. C 3. D 4. B Questions p (a) fuse rating (b) glass casing 8.6
7 (c) metal contact cap (d) fuse wire 2. (a) A fuse is used to prevent too large an electric current from flowing through the circuit. (b) The fuse and the electrical appliance should be connected in series. (c) (d) The melting point of the metal wire should be low. (e) It is the fuse rating. It means that the maximum current that can flow through the fuse without melting the metal wire inside the fuse is 3 A. 8.9 Multiple choice p C 2. B 3. B 4. C Fill in the blanks p V 2. earth 3. (a) ground (b) earthing 4. ring circuit 5. overloading Questions p (a) live wire (fill in brown) (b) neutral wire (fill in blue) (c) earth wire (fill in green and yellow) (d) fuse 2. (a) neural socket (b) earth socket (c) live socket 3. The reading of the ammeter will increase and the bulb will glow brighter. This is because the total resistance of the circuit decreases as the resistor is shorted by closing the switch Concept checking p True 2. False 3. False 4. False 5. True Questions p (a) The numerical markings 40 W and 60 W indicate the power of the bulbs. The marking 220 V indicates the voltage at which the bulbs should work. (b) Electric current flowing through bulb A = 40 W / 220 V = 0.18 A Electric current flowing through bulb B = 60 W / 220 V = 0.27 A 8.7
8 2. 5 A 220 V = 1100 W 3. (a) (i) Electric current = 500 W / 200 V = 2.5 A (ii) Electric current = 1000 W / 200 V = 5 A (b) Resistor A has a higher resistance as it allows a smaller current to flow through it Concept checking p False 2. False 3. True 4. True 5. True Questions p (a) Cost per kw h = $ / 802 = $0.88 (b) Amount being saved = kw 120 h $0.88 = $ (c) In normal use, the air conditioners do not always operate at their maximum power (i.e W). When the room temperature is low enough, the cooling operation of the air conditioners will stop and so the energy consumed per second (i.e. power) will be much lower. Therefore, the amount of electricity consumed by the air conditioners is smaller than the expected value. The actual amount being saved is thus less than the calculated value. (or other reasonable answers) 2. (a) Money being saved = 800 ( kw) 16 h $0.9 = $345.6 (b) In ordinary filament bulbs, a large amount of electrical energy is changed to heat energy and lost to the surroundings. On the other hand, in energy-saving fluorescent bulbs, most electrical energy is changed to light energy Concept checking p False 2. True 3. True 4. False 5. True Questions p Electrical appliances that work on the principle of the heating effect of an electric current Electrical appliances that work on the principle of the magnetic effect of an electric current A, E, F, I A, B, C, D, G, H 2. (a) There is metal coil inside the crane. When an electric current flows through the coil,a magnetic effect is produced. The metal coil acts as a magnet to attract the iron parts of the dumped cars. (b) No. This is because plastic cannot be attracted by the current-carrying metal coil. (c) The crane can be used to separate iron waste from household rubbish. The 8.8
9 current-carrying metal coil has magnetic effect. It can attract objects made of iron or other magnetic substances from the household rubbish. This helps to separate these objects from other rubbish for recycling. (or other reasonable answers) Part B Integrated Exercise Concept checking p False 2. False 3. False 4. True 5. True 6. True 7. False 8. False 9. True 10. True 11. False 12. False Multiple choice p B 2. D 3. D 4. D 5. D 6. D 7. D 8. B 9. C 10. B 11. B 12. A 13. D 14. C 15. A Questions p (a) The rheostat is connected wrongly. 8.9
10 (b) (c) The reading of the ammeter decreases. 2. (a) (b) Green and yellow: earth wire Brown: live wire Blue: neutral wire (c) No. The earth wire is a safety device which protects people from getting an electric shock. If there is a fault in the cooker (with the earth wire connected) and the electric current leaks to the metal case, the leaked electric current will flow through the earth wire to the ground. If the earth wire is not connected, the person who touches the metal case of the cooker will get an electric shock. (d) When the cooker is switched on, the electric current flowing through the cooker is greater than 3 A. The 3 A fuse will melt and an open circuit is formed. Therefore, the cooker does not work. 8.10
11 3. (a) Money being saved = ( ) kw 500 h $0.9 = $13.05 (b) Amount of electrical energy = 1.5 kw 0.5 h = 0.75 kw h (c) Electric current = (50% W) / 50,000 V = 2 A 4. (a) Electric current = 2 W / 5 V = 0.4 A (b) If one of the bulbs burns out, all the other bulbs will not light up. (c) A fuse should be connected in series with the set of Christmas tree lights. (d) If the filament of a bulb burns out, the electric current can flow through that bulb via the shunt wire, even that bulb does not light up. The circuit is still closed and therefore the rest of the bulbs can light up. 5. (a) They are connected in parallel. (b) (c) Total current = 100 W / 220 V W / 220 V = 0.45 A A = 7.27 A (d) (i) Total current = 7.27 A W / 220 V = 7.27 A A = A (ii) The fuse will melt and the circuit will be broken. All the three electrical appliances will stop working. (e) No. When he connects five types of electrical appliances with a low power to the extension unit, the electrical appliances can work properly at the same time if the total current drawn from the mains socket is smaller than 13 A. He can then use all the sockets in the extension unit at the same time. 6. (a) Electrical appliance Working current (A) Suitable fuse rating (A) Lamp Washing machine Air conditioner Refrigerator Television Electric rice cooker Electric water heater (b) Total unit of electricity used = (0.1 kw h kw 50 h kw h kw 1464 h kw 200 h kw 150 h kw 100 h) = kw h Total cost = (400 $0.86) + (600 $0.90) + (637.8 $1.00) = $ (c) (i) The air conditioner takes up the largest part of the cost of electricity. (ii) Use electric fans instead of air conditioners to reduce the cost of electricity. (or other reasonable answers) Part C Concept Diagram p electrical conductor 2. electrical insulator 8.11
12 3. closed circuit 4. open circuit 5. series circuit 6. parallel circuit 7. volt 8. voltmeter 9. ampere / milliampere 10. ammeter 11. ohm 12. resistor 13. rheostat 14. ring circuit 15. short circuit 16. overloading 17. kilowatt-hours 18. kilowatt-hour meter Part D Reading Comprehension p.72 (a) BS1363 and BS546 are the British Standard for domestic AC power plugs and sockets. (b) A thicker wire has a lower resistance and allows a larger current to flow through. (c) Cross-sectional area of each wire = 75 πr 2 = (0.075 mm) 2 = 1.33 mm 2 The maximum current that the wire can withstand is about 13 A. (d) Air conditioners, electric heaters and electric warmers are not suitable to use extension units. The electric current drawn by these electrical appliances may easily exceed 13 A, which will melt the fuse of the extension unit. (e) The longer the cable, the higher the resistance. This makes the heating effect more significant, increasing the chance of getting electrical fires. Part E Little Einstein s Corner p (a) Switch 1 Switch 2 Lamp (on/off) Open Open Off Open Closed On Closed Open On Closed Closed On (b) Switch 1 Switch 2 Lamp (on/off) at (A/B) at (A/B) A A On A B Off B A Off B B On (c) Mary s design is better because the lamp can be turned on and off by either switch. In John s design, when one switch is closed, he cannot use the other switch to turn off the lamp. 8.12
13 (d) 2. (a) (i) Resistance = 200 V / 0.4 A = 500 Ω (ii) Current = 220 V / 500 Ω = 0.44 A (iii) In (i), power = 200 V 0.4 A = 80.0 W In (ii), power = 220 V 0.44 A = 96.8 W (iv) The bulb applied with 220 V glows brighter because its power is higher. (b) Changing the mains voltage to 220 V can increase the power of the electrical appliances. 3. (a) Apply the formula: current = power / voltage. If the voltage is stepped up to a larger value, the current will get smaller. If the current flowing through the cables (of constant resistance) is smaller, the power loss in the cable will also be smaller. (b) This is because they only stand on one high-voltage cable which makes an open circuit. Therefore, no current flows through their bodies. (c) will the insulation of the child from the ground (e.g. Is the child wearing thick rubber shoes or leather shoes?) the voltage of the cable 8.13
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 informationClass 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 informationElectrical 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 informationChapter 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 informationUsing 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 informationJSUNIL 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 informationELECTRIC 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 informationHOW 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 informationELECTRICITY & 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 informationChapter 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 informationL 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 informationPAPER 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 informationAlternating Current (AC) Electricity
Alternating Current (AC) Electricity Alternating current or AC electricity is the type of electricity commonly used in homes and businesses throughout the world. While the flow of electrons through a wire
More informationOrdinary 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 informationCHAPTER 3 DOMESTIC ELECTRICITY
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
More information7J 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 informationAP 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 informationCHAPTER 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 informationWhat 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 informationIntext 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 informationCurrent, 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 informationWhich 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 informationHigh 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 information4 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 informationMagnetic 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 informationPage 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 informationThe rod and the cloth both become charged as electrons move between them.
1 polythene rod is rubbed with a cloth. polythene rod cloth The rod and the cloth both become charged as electrons move between them. The rod becomes negatively charged. Which diagram shows how the rod
More informationScience 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 informationFarr High School NATIONAL 4 PHYSICS. Unit 1 Electricity and Energy. Revision Notes
Farr High School NATIONAL 4 PHYSICS Unit 1 Electricity and Energy Revision Notes Content Practical electrical and electronic circuits - Measurement of current, voltage and resistance using appropriate
More informationElectricity 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 informationCHAPTER 13 MAGNETIC EFFECTS OF ELECTRIC CURRENT
CHAPTER 13 MAGNETIC EFFECTS OF ELECTRIC CURRENT Compass needle:- It is a small bar magnet, whose north end is pointing towards north pole and south end is pointing towards south pole of earth..hans Oersted
More information11.1 CURRENT ELECTRICITY. Electrochemical Cells (the energy source) pg Wet Cell. Dry Cell. Positive. Terminal. Negative.
Date: SNC1D: Electricity 11.1 CURRENT ELECTRICITY Define: CIRCUIT: path that electrons follow. CURRENT ELECTRICITY: continuous flow of electrons in a circuit LOAD: device that converts electrical energy
More informationElectricity Merit Badge
Electricity Merit Badge Class 4 Safety at Home June 13, 2017 Electricity Merit Badge Class 4 2017 National Scout Jamboree 1 Classes Class 1 Basics Electricity Class 2 Magnetism Class 3 Electric Power,
More information4 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 information7.9.2 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 informationWrite 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 informationElectrical 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 informationName: 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 informationChapter: Electricity
Chapter 13 Table of Contents Chapter: Electricity Section 1: Electric Charge Section 2: Electric Current Section 3: Electrical Energy 1 Electric Charge Positive and Negative Charge Atoms contain particles
More informationNational 4 Physics - Electricity and Energy Summary Notes
Electromagnetism Magnetic fields Magnetic fields are found around any permanent or electromagnet. They are normally invisible but can be shown up by placing a sheet of paper over the magnet and sprinkling
More informationEssential Electricity Homework Exercise 1
Homework Exercise 1 1. For each of the following electrical symbols, copy the symbol into you jotter and label it using the words below. Word bank resistor, voltmeter, battery, ammeter, bulb V A 2. State
More informationPhysics - 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 informationYear 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 informationThe 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 informationElectricity 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 information9. 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 informationSNC1D PHYSICS 4/6/2013. THE CHARACTERISTICS OF ELECTRICITY L Electrical Resistance (P ) Electrical Resistance. Electrical Resistance
SNC1D PHYSICS THE CHARACTERISTICS OF ELECTRICITY L Electrical Resistance (P.441-443) Electrical Resistance Have you ever noticed that when you recharge your cellphone, MP3 player, or laptop computer, the
More informationQuestion 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 informationV=I R P=V I P=I 2 R. E=P t V 2 R
Circuit Concepts Learners should be able to: (a) draw, communicate and analyse circuits using standard circuit symbols using standard convention (b) apply current and voltage rules in series and parallel
More informationUNIT 4 Electrical Applications
UNIT 4 Electrical Applications Topic How do the sources used 4.1 to generate electrical energy compare? (Pages 244-51) Topic 4.1: How do the sources used to generate electrical energy compare? Topic 4.6:
More informationConceptual Physics Electricity and Circuits Practice Exam 2011
Name: Class: Date: Conceptual Physics Electricity and Circuits Practice Exam 2011 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. In order to form an electric
More information16.3 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 informationElectricity. Chapter 20
Electricity Chapter 20 Types of electric charge Protons + charge Electrons - charge SI unit of electric charge is the coulomb (C) Interactions between charges Like charges repel Opposite charges attract
More information1. Why does a compass needle get deflected when brought near a bar magnet?
1. Why does a compass needle get deflected when brought near a bar magnet? The needle of a compass is a small magnet. That s why when a compass needle is brought near a bar magnet, its magnetic field lines
More informationPURE 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 informationMagnetic fields 1. Place the magnet under a sheet of paper and sprinkle iron filings on top. N S
Electromagnetism Magnetic fields 1. Place the magnet under a sheet of paper and sprinkle iron filings on top. 2. (a) N S (b) N S N S (c) S N N S 3. (a) Electromagnet or solenoid (b) A magnetic field. (c)
More informationParts 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 informationElectrical 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 informationELECTRICAL. CDTA Technical Training Center
ELECTRICAL ATOMIC STRUCTURE Protons positive charge Electron negative charge Neutron - neutral Electricity is the movement of electrons from atom to atom ELECTRON FLOW CONDUCTOR - Materials which have
More information2. 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(d) The magnetic field lines, produced around a straight current-carrying conductor, are concentric circles. Their centres lie on the wire.
Page 240»Exercise» Question 1: Which of the following correctly describes the magnetic field near a long straight wire? (a) The field consists of straight lines perpendicular to the wire (b) The field
More information45 Current Electricity. February 09, Current Electricity. What we will learn, Arc Attack. Electric Man. 1
Current Electricity What we will learn, Arc Attack Electric Man www.mrcjcs.com 1 Conductors and Insulators An electric current is a flow of electric charge. Set up a simple electrical circuit and insert
More informationPHYSICS 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 informationELECTRIC CURRENT AND ITS EFFECT
14 ELECTRIC CURRENT AND ITS EFFECT TEXTBOOK EXERCISES AND THEIR ANSWERS Q.1. Draw in your notebook the symbols to represent the following components of electrical circuits, connecting wires, switch in
More information(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 informationHow 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 informationMAGNETIC EFFECTS OF ELECTRIC CURRENT
MAGNETIC EFFECTS OF ELECTRIC CURRENT It is observed that when a compass is brought near a current carrying conductor the needle of compass gets deflected because of flow of electricity. This shows that
More information4.2 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 informationUnit 10 Measuring Instruments
Objectives: Unit 10 Discuss the operation of a d Arsonval meter movement. Connect a voltmeter to a circuit. Read an analog multimeter. Connect an ammeter. Measure resistance using an ohmmeter. Analog meters
More informationMagnetism and Electricity ASSIGNMENT EDULABZ. the mere presence of magnet, is called...
Magnetism and Electricity ASSIGNMENT 1. Fill in the blank spaces by choosing the correct words from the list given below. List : magnetic field, magnetic keepers, electric bell, stop, magnetic induction,
More informationElectricity. Teacher/Parent Notes.
Electricity. Teacher/Parent Notes. Caution. The yellow fan. If this is used with 6 Volts, the fan will fly into the air with some force so it is advisable to keep faces well away from it! Batteries. Please
More informationElectrical Measuring Instruments
UNIT 12 Electrical Measuring Instruments Learning Objectives After studying this unit, the student will be able Understand different measuring instruments used in electricity Understand the working of
More informationWhat is represented by this BrainBat?
What is represented by this BrainBat? What is represented by this BrainBat? Hint: Say what you see. What is represented by this BrainBat? Hint: Say what you see. Answer: Octopi Electricity and Magnetism
More informationWork done and Moment. When using the equipment, John wants to do 300J of work in each lift.
Yr 11 Physics worksheet Paper 2 Work done and Moment Q1) The diagram shows weightlifting equipment found in most gyms. When using the equipment, John wants to do 300J of work in each lift. He can vary
More informationUnit 3 Lesson 2 Electric Current. Copyright Houghton Mifflin Harcourt Publishing Company
Current Events What is an electric current? Electrical energy is the energy of electric charges. In most devices that use electrical energy, the electric charges flow through wires. The rate of flow of
More informationElectrical 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 informationIntroduction to Electricity & Electrical Current
Introduction to Electricity & Electrical Current Physical Science Georgia Performance Standards: SPS10a. Investigate static electricity in terms of friction, induction, and conduction. SPS10b. Explain
More informationAll About Electromagnetism
5. All About Electromagnetism Maglev or magnetic levitation is a system of transportation that suspends, guides and propels vehicles. This technology has the potential to exceed 4000 mph (6437 km/h) if
More informationElectricity and Magnetism. Module 6
Electricity and Magnetism Module 6 What is electricity? The collection or flow of electrons in the form of an electric charge What is static electricity? When two objects rub against each other electrons
More informationElectricity and Magnetism. Introduction/Review
Electricity and Magnetism Introduction/Review Overall Expectations By the end of this unit, students will: 1. Analyse the social, economic, and environmental impact of electrical energy production and
More information18.5. Electrical Circuits and Safety
18.5 Electrical Circuits and Safety Electrical Circuits An electric circuit is a complete path through which a charge can flow. This is called a closed circuit. When the electric current cannot flow, this
More informationMAGNETIC EFFECTS OF CURRENT
Magnet A magnet is an object, which attracts pieces of iron, steel, nickel and cobalt. Naturally Occurring Magnet Lodestone is a naturally occurring magnet. It is actually a black coloured, oxide ore of
More informationElectric Circuits Exam
Electric Circuits Exam 1. The diagram below represents a lamp, a 10-volt battery, and a length of nichrome wire connected in series. 4. Which circuit has the smallest equivalent resistance? A) B) As the
More informationCurrent Electricity. GRADE 10 PHYSICAL SCIENCE Robyn Basson CAPS
Current Electricity GRADE 10 PHYSICAL SCIENCE Robyn Basson CAPS What is current electricity? The flow of moving charge, usually carried by moving electrons in a wire. Circuits A path in which charges continually
More informationElectricity 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 information8.2 Electric Circuits and Electrical Power
8.2 Electric Circuits and Electrical Power Every electrical device uses current to carry energy and voltage to push the current. How are electrical devices designed? What types of parts are used in an
More informationNCERT solution for Electricity
NCERT solution for Electricity 1 Question 1 Fill in the blanks : (a) A device that is used to break an electric circuit is called (b) An electric cell has terminals. (c) Electric cell is a device which
More informationBatteries n Bulbs: Voltage, Current and Resistance (8/6/15) (approx. 2h)
Batteries n Bulbs: Voltage, Current and Resistance (8/6/15) (approx. 2h) Introduction A simple electric circuit can be made from a voltage source (batteries), wires through which current flows and a resistance,
More information12.7 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 informationExperiment 3: Ohm s Law; Electric Power. Don t take circuits apart until the instructor says you don't need to double-check anything.
Experiment 3: Ohm s Law; Electric Power. How to use the digital meters: You have already used these for DC volts; turn the dial to "DCA" instead to get DC amps. If the meter has more than two connectors,
More informationMAGNETIC EFFECTS OF ELECTRIC CURRENT
MAGNETIC EFFECTS OF ELECTRIC CURRENT VERY SHORT ANSWER TYPE QUESTION [1 MARK] 1. Name the type of current: (a) used in household supply. (b) given by a cell. (a) Alternating current. (b) Direct current.
More informationElectrical 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 informationto 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 informationElectricity concepts teacher backgrounder
Electricity concepts teacher backgrounder What is electricity, where does it come from and what do we use it for? Scientifically, electricity is the movement of electrons from one atom to another. This
More informationELECTRICITY UNIT NAME
ELECTRICITY UNIT NAME Atom An atom is the smallest particle characterizing an element. All matter in the universe is made up of a combination of different atoms. Atoms are made up of protons, neutrons
More informationUsing 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 informationFACT SHEET Standard: Electrical Safety
What is a Ground Fault Circuit Interrupter? FACT SHEET The ground-fault circuit interrupter, or GFCI, is a fast-acting circuit breaker designed to shut off electric power in the event of a ground-fault
More informationMAGNETIC EFFECT OF ELECTRIC CURRENT
BAL BHARATI PUBLIC SCHOOL, PITAMPURA Class X MAGNETIC EFFECT OF ELECTRIC CURRENT 1. Magnetic Field due to a Current through a Straight Conductor (a) Nature of magnetic field: The magnetic field lines due
More information1. 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 informationreflect energy: the ability to do work
reflect Have you ever thought about how much we depend on electricity? Electricity is a form of energy that runs computers, appliances, and radios. Electricity lights our homes, schools, and office buildings.
More information