# 3 Electricity from Magnetism

Size: px
Start display at page:

## Transcription

2 2. Describe What is electromagnetic induction? SUCCESS FOR AN INSTANT As Faraday experimented with the electromagnetic ring, he noticed something interesting. At the instant he connected the wires to the battery, the galvanometer pointer moved. This movement showed that an electric current was present. The pointer moved again at the instant he disconnected the battery. However, he did not see an electric current when the battery was fully connected. Faraday saw that electric current in the second wire happened only when the magnetic field changed. It changed as the battery was connected and disconnected. The process of creating a current in a circuit by a changing a magnetic field is called electromagnetic induction. Faraday did many more experiments in this area. Some of his results are shown in the figure below. Factors that Affect an Induced Current a An electric current is induced when you move a magnet through a coil of wire. b A greater electric current is induced if you move the magnet faster through the coil because the magnetic field is changing faster. TAKE A LOOK 3. Identify What are two factors that determine the size of the electric current induced? c A greater electric current is induced if you add more loops of wire. This magnet is moving at the same speed as the magnet in b. d The induced electric current reverses direction if the magnet is pulled out rather than pushed in. Interactive Textbook 42 Electromagnetism

3 INDUCING ELECTRIC CURRENT Faraday s experiments also showed that moving either the magnet or the wire changes the magnetic field around the wire. An electric current is made when a magnet moves in a coil of wire. An electric current is also made when a wire moves between the poles of a magnet. As the wire moves between the poles of the magnet, it cuts through magnetic field lines. This induces an electric current. TAKE A LOOK 4. Predict If the wire in the picture does not move, will there be an electric current? Explain your answer. In the figure above, an electric current is induced only by moving the wire across the magnetic field lines. Moving the wire induces the current because the force at each magnetic field line makes electric charges move. The charges only move in a wire when the wire moves through the magnetic field. How Do Electric Generators Work? Every day, you use electricity made by machines called generators. The figure below shows the parts of a simple generator. Electric motors turn electrical energy into mechanical energy (movement). An electric generator uses electromagnetic induction to change mechanical energy into electrical energy. Parts of a Simple Generator Generators contain a coil of wire attached to a rod that is free to rotate. This generator has a crank that is used to turn the coil. Slip rings are attached to the ends of the wire in the coil. Electric current leaves the generator when the slip rings touch a pair of brushes. The coil is placed between the poles of a permanent magnet or electromagnet. 5. Describe What does an electric generator do? TAKE A LOOK 6. Identify What is the source of mechanical energy for this electric generator? Interactive Textbook 43 Electromagnetism

4 STANDARDS CHECK PS 3a Energy is a property of many substances and is associated with heat, light, electricity, mechanical motion, sound, nuclei, and the nature of a chemical. Energy is transferred in many ways. 7. Identify What are three sources of energy that generators turn into electrical energy? 8. Describe What does a transformer do? Math Focus 9. Compare Suppose the secondary coil has 100 loops and the primary coil has 200. What is the secondary coil voltage compared to the primary coil voltage? ALTERNATING CURRENT The electric current that the generator produces changes direction each time the coil makes a half-turn. Because the electric current changes direction, it is an alternating current. Generators in power plants make alternating current. Generators in power plants are very large. They have many coils of wire instead of just one. In most large generators, the magnet turns instead of the coils. GENERATING ELECTRICAL ENERGY The energy that generators convert into electrical energy comes from different sources. The source in nuclear power plants is thermal energy from a nuclear reaction. The energy boils water into steam. The steam turns a turbine. The turbine turns the magnet of the generator, which induces electric current and generates electrical energy. Other kinds of power plants burn fuel such as coal or gas to release thermal energy. We can use energy from wind to turn turbines. We also convert the power of rushing water into electrical energy in a hydroelectric power plant. What Are Transformers? Another device that relies on induction is a transformer. A transformer increases or decreases the voltage of alternating current. A simple transformer is made up of two coils of wire wrapped around an iron ring. The primary (or first) coil gets alternating current from an electrical energy source. The current makes an iron ring an electromagnet. The changing magnetic field in the iron ring induces a current in the secondary (or second) coil. The number of loops in the primary and secondary coils determines if the voltage increases or decreases. The table below shows how voltage is affected by the number of loops. Number of loops in primary coil Number of loops in secondary coil Voltage in primary coil V 200 V V 50 V Voltage in secondary coil Interactive Textbook 44 Electromagnetism

5 STEP-UP, STEP-DOWN The figure below shows two types of transformers. The type of transformer is determined by the number of loops in the primary and secondary coils. A step-up transformer has more loops of wire in the secondary coil, so it increases voltage and decreases current. A step-down transformer has fewer loops of wire in the secondary coil, so it decreases voltage and increases current. However, the amount of energy going into and out of the transformer does not change. How Transformers Change Voltage Step-up Transformer The primary coil has fewer loops than the secondary coil. So, the voltage in the secondary coil is higher than the voltage in the primary coil. The voltage is increased. Step-down Transformer The primary coil has more loops than the secondary coil. So, the voltage in the secondary coil is lower than the voltage in the primary coil. The voltage is decreased. Primary coil Secondary coil Primary coil Secondary coil Math Focus 10. Determine A transformer has 300 loops in the primary coil and 100 loops in the secondary coil. The primary coil voltage is 90 V. What would be the voltage in the secondary coil? What kind of transformer is this? ELECTRICAL ENERGY FOR YOUR HOME Electric power companies supply energy for most homes. Electricity travels over long distances. As it travels, it loses power in the form of heat because of the resistance in the cables. Much less power is wasted if the current is low and voltage high. So power companies transmit electricity at high voltage and low current. However, high voltage in your home is dangerous. So, the voltage must be decreased again before the current goes to your home. Two step-down transformers decrease the voltage before the current enters your home. Getting Energy to Your Home The voltage is stepped up thousands of times at the power plant. 2 The voltage is stepped down at a local power distribution center. 3 The voltage is stepped down again at a transformer near your house. 11. Describe Why are step-down transformers needed before the electricity from the power company enters your home? Interactive Textbook 45 Electromagnetism

6 Section 3 Review NSES PS 3a SECTION VOCABULARY electric generator a device that converts mechanical energy into electrical energy electromagnetic induction the process of creating a current in a circuit by changing a magnetic field transformer a device that increases or decreases the voltage of alternating current 1. Compare How are an electric generator and an electric transformer different? 2. Interpret Graphics What kind of transformer is the transformer below? How does the voltage change with this kind of transformer? 3. Determine A transformer has 500 loops in its primary coil and 5,000 loops in its secondary coil. What is the voltage in the secondary coil if the voltage in the primary coil is 2,000 V? What type of transformer is this? 4. Explain How does a generator produce an electric current? 5. Explain Why does an electric power plant increase the voltage of electricity as it leaves the power plant on its way to your home? Interactive Textbook 46 Electromagnetism

7 N Electricity and Magnetism Answer Key continued Review 1. You rub it in one direction with one pole of a magnet. This makes the domains in the nail line up. 2. The Earth s south magnetic pole is closest to the North Pole. 3. It s stronger at the South Pole because magnetic force is always strongest closest to the poles of a magnet. 4. In materials that are not magnetic, the magnetic fields of individual atoms cancel each other out. 5. a permanent magnet 6. Heat would cause the domains to move out of alignment. SECTION 2 MAGNETISM FROM ELECTRICITY 1. The electric current creates a magnetic field. The needle lines up with the magnetic field. 2. It is the interaction between electricity and magnetism. 3. Have more coils of wire and more current. 4. It combines the field of the solenoid and the field of the magnetized core. 5. You can turn an electromagnet on and off, so it works only when you want it to. 6. vending machines and doorbells 7. The electric current in a wire creates a magnetic field that exerts a force on the needle. 8. mechanical energy 9. It measures electric current or voltage. Review 1. An electric current in a wire makes a magnetic field. The more current you add and the more coils of wire there are, the stronger the magnetic field. 2. The electromagnet (the left-hand drawing) has a stronger magnetic field. 3. A current in the galvanometer causes the permanent magnet to push the electromagnet, rotating the pointer. 4. a metal detector, a vending machine, a maglev train, and a doorbell 5. The electric current in the armature causes the magnet to push on the armature. ELECTRICITY FROM MAGNETISM 1. He was trying to make a magnetic field make an electric current. 2. It is the process in which electric current is made by a changing magnetic field. 3. the speed of the magnet moving through the coil; the number of loops of wire 4. No, because a current is made only when a magnet moves in a coil of wire or when a wire moves between the poles of a magnet. 5. changes mechanical energy into electrical energy 6. the person turning the crank 7. thermal, wind, moving water 8. A transformer increases or decreases the voltage of alternating current. 9. half as much V, step-down transformer 11. Possible answers: High voltage in a home is dangerous; voltage must be decreased. Review 1. A generator changes mechanical energy to electrical energy. A transformer changes the voltage of alternating current. 2. It is a step-down transformer because it has more loops in the first coil, so the voltage decreases, or steps down. 3. The secondary coil has 10 times the voltage of the primary coil, or 20,000 V. This is a step-up transformer. 4. It uses electromagnetic induction to change mechanical energy into electrical energy. The electric current is induced because a magnetic force causes electric charges to move when a wire moves through a magnetic field. 5. to decrease the amount of power lost from resistance (heat) as electricity travels through cables Interactive Textbook Answer Key 93 Electricity and Magnetism

### Magnets and magnetism

Chapter 2 Electromagnetism Section 1 Magnets and magnetism Vocabulary: magnet magnetic pole magnetic force Properties of Magnets Magnetic Poles on a magnet, the magnetic poles are the locations where the

### Magnetism from Electricity

2 What You Will Learn Identify the relationship between an electric current and a magnetic field. Compare solenoids and electromagnets. Describe how electromagnetism is involved in the operation of doorbells,

### Unit 2: Electricity and Energy Resources

8 Table of Contents Unit 2: Electricity and Energy Resources Chapter 8: Magnetism and Its Uses 8.1: Magnetism 8.2: Electricity and Magnetism 8.3: Producing Electric Current 8.1 Magnets Magnetism Magnetism:

### Section 1: Magnets and Magnetic Fields Section 2: Magnetism from Electric Currents Section 3: Electric Currents from Magnetism

Section 1: Magnets and Magnetic Fields Section 2: Magnetism from Electric Currents Section 3: Electric Currents from Magnetism Key Terms Magnetic Poles Magnetic Fields Magnets The name magnet comes from

### Unit 2: Electricity and Energy Resources

8 8 Table of Contents Unit 2: Electricity and Energy Resources Chapter 8: Magnetism and Its Uses 8.1: Magnetism 8.2: Electricity and Magnetism 8.3: Producing Electric Current 8.1 Magnets More than 2,000

### 3/31/2016. Unit 2: Electricity and Energy Resources. Magnets. Magnets. Magnetic Force. Magnetic Field. Chapter 8: Magnetism and Its Uses

8 8 Table of Contents Unit 2: Electricity and Energy Resources Chapter 8: and Its Uses : : Electricity and : Magnets More than 2,000 years ago Greeks discovered deposits of a mineral that was a natural

### Chapter 18 Magnetism Student Notes

Chapter 18 Magnetism Student Notes Section 18.1 Magnets and Magnet Fields Magnets More than discovered deposits of a that was a. The mineral is now called. These magnets were used by the ancient peoples

### 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?

### Photographs of large cities, such as Seattle, Washington, are visible reminders of how much people rely on electrical energy.

Photographs of large cities, such as Seattle, Washington, are visible reminders of how much people rely on electrical energy. Generating Electric Current How is voltage induced in a conductor? According

### Chapter Review USING KEY TERMS UNDERSTANDING KEY IDEAS. Skills Worksheet. Multiple Choice

Skills Worksheet Chapter Review USING KEY TERMS Complete each of the following sentences by choosing the correct term from the word bank. electric motor transformer magnetic force electric generator magnetic

### ELECTROMAGNETIC INDUCTION. Faraday s Law Lenz s Law Generators Transformers Cell Phones

ELECTROMAGNETIC INDUCTION Faraday s Law Lenz s Law Generators Transformers Cell Phones Recall Oersted's principle: when a current passes through a straight conductor there will be a circular magnetic field

### Ch. 3 Magnetism and Electromagnetism

Ch. 3 Magnetism and Electromagnetism Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Magnetic field lines around a bar magnet a. are only perpendicular

### SPH3U UNIVERSITY PHYSICS

SPH3U UNIVERSITY PHYSICS ELECTRICITY & MAGNETISM L (P.599-604) The large-scale production of electrical energy that we have today is possible because of electromagnetic induction. The electric generator,

### Chapter 8 Magnetism and Its Uses. Section 1: Magnetism Section 2: Electricity and Magnetism Section 3: Producing Electric Current

Chapter 8 Magnetism and Its Uses Section 1: Magnetism Section 2: Electricity and Magnetism Section 3: Producing Electric Current Section 1: Magnetism Standard 6: Demonstrate an understanding of the nature,

### Electromagnets & Induction Vocabulary

Electromagnets & Induction Vocabulary Term Definition Coil Solenoid Electric Motor Parts of an electric motor: Rotor commutator armature brushes Electromagnetic Induction Faraday s Law of Induction Generator

### 1. Which device creates a current based on the principle of electromagnetic induction?

Assignment 2 Electromagnetism Name: 1. Which device creates a current based on the principle of electromagnetic induction? A) galvanometer B) generator C) motor D) solenoid 2. The bar magnet below enters

### Science 30 Unit C Electromagnetic Energy

Science 30 Unit C Electromagnetic Energy Outcome 1: Students will explain field theory and analyze its applications in technologies used to produce, transmit and transform electrical energy. Specific Outcome

### Electromagnetic Induction (approx. 1.5 h) (11/9/15)

(approx. 1.5 h) (11/9/15) Introduction In 1819, during a lecture demonstration, the Danish scientist Hans Christian Oersted noticed that the needle of a compass was deflected when placed near a current-carrying

### 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?

### 1. What type of material can be induced to become a temporary magnet? A) diamagnetic B) ferromagnetic C) monomagnetic D) paramagnetic

Assignment 1 Magnetism and Electromagnetism Name: Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. Show appropriate workings. 1. What type of

### Chapter 17 Notes. Magnetism is created by moving charges.

Chapter 17 Notes Section 17.1 Electric Current and Magnetism Hans Christian Øersted (1819), a Danish physicist and chemist - compass needle near a wire circuit and with current flowing through the wire,

### SPH3U1 Lesson 10 Magnetism. If the wire through a magnetic field is bent into a loop, the loop can be made to turn up to 90 0.

SPH3U1 Lesson 10 Magnetism GALVAOMETERS If the wire through a magnetic field is bent into a loop, the loop can be made to turn up to 90 0. otice how the current runs in the opposite directions on opposite

### Ordinary Level Physics ANSWERS : ELECTROMAGNETIC INDUCTION. Solutions

Ordinary Level Physics ANSWERS : ELECTROMAGNETIC INDUCTION Solutions 2015 Question 12 (d) [Ordinary Level] A solenoid (long coil of wire) is connected to a battery as shown. (i) Copy the diagram into your

### Imagine not being able to use anything that plugs into an electrical socket.

Physics 1003 Electromagnetism (Read objectives on screen.) (boy thinking on screen) Imagine your everyday life without talking on the telephone or watching TV. or listening to a radio or playing a CD.

### ANSWER KEY. Using Electricity and Magnetism. Chapter Project Worksheet 1

Using Electricity and Magnetism Using Electricity and Magnetism Chapter Project Worksheet 1 1 6. Students data will vary greatly depending on the appliances and devices they examine as well as on the size

### Exploring the Energy Grid Grades 6-8. Name:

Exploring the Energy Grid Grades 6-8 Name: Exploration 1 Rapidly turn the handles clockwise on all three generators at the end of the table, watching the System Voltage panel: 1. Draw the needle when the

### ELECTROMAGNETISM. 1. the number of turns. 2. An increase in current. Unlike an ordinary magnet, electromagnets can be switched on and off.

ELECTROMAGNETISM Unlike an ordinary magnet, electromagnets can be switched on and off. A simple electromagnet consists of: - a core (usually iron) - several turns of insulated copper wire When current

### Magnetism - General Properties

Magnetism - General Properties A magnet, when suspended from a string, will align itself along the north - south direction. Two like poles of a magnet will repel each other, while opposite poles will attract.

### 21.2 Electromagnetism

In 1820 Hans Oersted discovered how magnetism and electricity are connected. A unit of measure of magnetic field strength, the oersted, is named after him. Electricity and Magnetism How can an electric

### What is Electricity? Lesson one

What is Electricity? Lesson one Static Electricity Static Electricity: an electrical charge that builds up on an object Most of the time, matter is electrically neutral. The same number of positive and

### KS3 Revision. 8J Magnets and Electromagnets

KS3 Revision 8J Magnets and Electromagnets 1 of 29 Boardworks Ltd 2007 Contents 8J Magnets and Electromagnets Magnetic materials Magnetic fields Electromagnets Summary activities 2 of 29 Boardworks Ltd

### Physical Science Lecture Notes Chapter 13

Physical Science Lecture Notes Chapter 13 I. Section 13-1 Electricity, Magnetism & Motion A. Electrical & mechanical energy 1. Magnetic forces repel when alike and attract when opposite 2. Electric current

### Magnetism Ch Magnetism is a force that acts at a distance

Magnetism Ch 21 22.1 Magnetism is a force that acts at a distance 1 Magnets attract & repel other magnets. The attraction between the north pole of a magnet and the south pole of another magnet is based

### Essential Question: How can currents and magnets exert forces on each other?

Essential Question: How can currents and magnets exert forces on each other? Standard: S8P5c. Investigate and explain that electric currents and magnets can exert force on each other. Concepts for Review

### Magnetism and Electricity

Magnetism and Electricity Way back in the first lesson of this magnetism block, we talked about the fact that magnetic fields are caused by electrons moving in the same direction. Up to this point, we

### Is it Magnetic? 1. Fill in each table. List things ATTRACTED by a magnet on the LEFT and things NOT ATTRACTED on the RIGHT.

Is it Magnetic? 1. Fill in each table. List things ATTRACTED by a magnet on the LEFT and things NOT ATTRACTED on the RIGHT. MAGNETIC NON-MAGNETIC # Object Made from check # Object Made from check --- ------------

### MAGNETIC EFFECTS OF ELECTRIC CURRENT. To understand Magnetic effects of Electric current, first we should know what is the Magnet?

MAGNETIC EFFECTS OF ELECTRIC CURRENT To understand Magnetic effects of Electric current, first we should know what is the Magnet? Magnet A Magnet is an object which attracts pieces of iron, steel, nickel

### Almost 200 years ago, Faraday looked for evidence that a magnetic field would induce an electric current with this apparatus:

Chapter 21 Electromagnetic Induction and Faraday s Law Chapter 21 Induced EMF Faraday s Law of Induction; Lenz s Law EMF Induced in a Moving Conductor Changing Magnetic Flux Produces an E Field Inductance

### GraspIT AQA GCSE Magnetism and Electromagnetism - Questions

A. Permanent and Induced Magnetism, Magnetic Forces and Fields 1. The following question is about magnets. a. Iron is a magnetic material. Name two other magnetic elements. (2) b. Describe the effect a

MSRAJA ELGADFY/ELECTROMAGENETIC PAPER3 1- In Fig 91, A and B are two conductors on insulating stands Both A and B were initially uncharged X Y A B Fig 91 (a) Conductor A is given the positive charge shown

### Magnetic Effects of Electric Current

CHAPTER13 Magnetic Effects of Electric Current Multiple Choice Questions 1. Choose the incorrect statement from the following regarding magnetic lines of field (a) The direction of magnetic field at a

### reflect 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.

### Electricity and Magnetism. Introduction to Chapter 10

3 Electricity and Magnetism Introduction to Chapter 10 Electricity and magnetism are related to each other. As you will learn in this chapter, the interactions between electricity and magnetism are the

### Like poles repel, unlike poles attract can be made into a magnet

Topic 7 Magnetism and Electromagnetism 7.1 Magnets and Magnetic Fields A permanent magnet has its own magnetic field : region in which a magnetic force is felt Poles are the places where the magnetic force

### 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

### 11/2/2011. Magnetic field =surrounds a magnet and can exert magnetic forces.

It is a substance that contains a magnetic field. There are three primary types of magnets; Ferromagnetic- A substance that is naturally and permanently magnetic like iron. Paramagnetic- which becomes

### Electromagnets ENERGY USE AND DELIVERY LESSON PLAN 3.3. Public School System Teaching Standards Covered

ENERGY USE AND DELIVERY LESSON PLAN 3.3 Electromagnets This lesson is designed for 3rd 5th grade students in a variety of school settings (public, private, STEM schools, and home schools) in the seven

### IT'S MAGNETIC (1 Hour)

IT'S MAGNETIC (1 Hour) Addresses NGSS Level of Difficulty: 4 Grade Range: 3-5 OVERVIEW In this activity, students will create a simple electromagnet using a nail, a battery, and copper wire. They will

### Unit 8 ~ Learning Guide Name:

Unit 8 ~ Learning Guide Name: Instructions: Using a pencil, complete the following notes as you work through the related lessons. Show ALL work as is explained in the lessons. You are required to have

### Generators and Motors

TOPIC 6 Generators and Motors Imagine depending on battery-powered flashlights to light a sports field for a night game. ot likely? Batteries are fine for portable power, but they cannot supply the quantities

### Understanding Electricity and Electrical Safety Teacher s Guide

Understanding Electricity and Electrical Safety Teacher s Guide Note to Instructor: The activities and experiments in this booklet build on each other to develop a student s understanding of electricity

### Magnetism. Magnetism CHAPTER 14. Chapter Preview. Electromagnetic Induction and Faraday s Law Transformers

CHAPTER 14 Magnetism Chapter Preview 14.1 Magnets and Magnetic Fields Magnets Magnetic Fields 14.2 Magnetism from Electric Currents Producing Magnetism from Electric Currents Electromagnetic Devices 14.3

### HSC Physics motors and generators magnetic flux and induction

PD32a HSC Physics motors and generators student name....................... Monday, 30 May 2016 number о number о 1 1 c 26 2 2 17 27 3 3 18 28 4 4 19 29 5 5 6 6 7 7 8 8 9 9 10 a 10 b 11 c 12 d 13 e 14

### 1 A strong electromagnet is used to attract pins. core. current. coil. pins. What happens when the current in the coil is halved?

1 strong electromagnet is used to attract pins. current core pins coil What happens when the current in the coil is halved? No pins are attracted. Some pins are attracted, but not as many. The same number

### Magnets. Unit 6. How do magnets work? In this Unit, you will learn:

Previously From Page 220 Forces appear whenever two objects interact. From Page 225 Unbalanced forces cause the motion of a body to change. Unit 6 Magnets How do magnets work? Magnets are interesting things

### 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;

### ALTERNATING CURRENT - PART 1

Reading 9 Ron Bertrand VK2DQ http://www.radioelectronicschool.com ALTERNATING CURRENT - PART 1 This is a very important topic. You may be thinking that when I speak of alternating current (AC), I am talking

### Period 16 Activity Sheet: Motors and Generators

Name Section Period 16 Activity Sheet: Motors and Generators Activity 16.1: How Are Electric Motors and Generators Related? a) Generators. 1) Attach a hand-cranked generator to a small motor and turn the

### UNIT 2. INTRODUCTION TO DC GENERATOR (Part 1) OBJECTIVES. General Objective

DC GENERATOR (Part 1) E2063/ Unit 2/ 1 UNIT 2 INTRODUCTION TO DC GENERATOR (Part 1) OBJECTIVES General Objective : To apply the basic principle of DC generator, construction principle and types of DC generator.

### 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

### 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 (-).

### Magnetism can produce current.

Page of 5 KY CONCPT Magnetism can produce current. BFOR, you learned Magnetism is a force exerted by magnets lectric current can produce a magnetic field lectromagnets can make objects move NOW, you will

### 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

### 7.9.8 Elctromagnetism

7.9.8 Elctromagnetism 71 minutes 86 marks Page 1 of 25 Q1. The diagram shows an electromagnet used in a door lock. (a) The push switch is closed and the door unlocks. Explain in detail how this happens.

### MAGNETIC 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

### ELECTRICAL PRINCIPLES AND TECHNOLOGIES

1 ELECTRICAL PRINCIPLES AND TECHNOLOGIES Science 9 Unit D 2 3.0 Devices and systems convert energy with varying efficiencies. 3.1 Energy Forms and Transformations 1 Electrical Energy: Tesla Coil 3 A Tesla

### Materials can be classified 3 ways

Magnetism Magnetism A magnet is an object that can attract other objects containing iron, cobalt, or nickel. Magnetic substances are created when electrons from within the atom or from another atom spins

### Magnetic Effects of Electric Current

CHAPTER 13 Magnetic Effects of Electric Current In the previous Chapter on Electricity we learnt about the heating effects of electric current. What could be the other effects of electric current? We know

### I.E.S. Cristo Del Socorro de Luanco. Magnetism

Magnetism Magnetism is a force of attraction or repulsion that acts at a distance. It is due to a magnetic field, which is caused by moving electrically charged particles or is inherent in magnetic objects

### Experiment 6: Induction

Experiment 6: Induction Part 1. Faraday s Law. You will send a current which changes at a known rate through a solenoid. From this and the solenoid s dimensions you can determine the rate the flux through

### Construction Set: Smart Grid System

Construction Set: Smart Grid System Curriculum for Grades 3-5 Student Edition Center for Mathematics, Science, and Technology Illinois State University 2017 www.smartgridforschools.org Look around your

### Chapter 29 Electromagnetic Induction and Faraday s Law

Chapter 29 Electromagnetic Induction and Faraday s Law 29.1 Induced EMF Units of Chapter 29 : 1-8 29.3 EMF Induced in a Moving Conductor: 9, 10 29.4 Electric Generators: 11 29.5 Counter EMF and Torque;

### Science Part B Chapter 4- Electrical Energy. Lesson 1-

Science Part B Chapter 4- Electrical Energy Lesson 1- Most atoms have equal numbers of protons, which are positively charged, and electrons, which are negatively charged. These atoms have no charge; they

### INSTRUCTIONS TO CANDIDATES

Kenya Certificate of Secondary Education NAME:.... SCHOOL: DATE:... ELECTROMAGNETISM 1 INSTRUCTIONS TO CANDIDATES Answer ALL questions in this paper in the spaces provided. 1 1. Fran has a balancing game.

### Describe an experiment to demonstrate that there is a magnetic field around a current carrying conductor.

EXERCISE 10 (A) Question 1: Describe an experiment to demonstrate that there is a magnetic field around a current carrying conductor. Solution 1: Experiment: In Fig, AB is a wire lying in the north- south

### Lab 6: Magnetic Fields

Names: 1.) 2.) 3.) Lab 6: Magnetic Fields Learning objectives: Observe shape of a magnetic field around a bar magnet (Iron Filing and magnet) Observe how static charged objects interact with magnetic fields

### Introduction 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

### Introduction: Electromagnetism:

This model of both an AC and DC electric motor is easy to assemble and disassemble. The model can also be used to demonstrate both permanent and electromagnetic motors. Everything comes packed in its own

### CHAPTER 8: ELECTROMAGNETISM

CHAPTER 8: ELECTROMAGNETISM 8.1 Effect of a Magnet on a Current-carrying Conductor 8.1.1 Straight Wire Magnetic fields are circular Field is strongest close to the wire Increasing the current increases

### VANDERBILT STUDENT VOLUNTEERS FOR SCIENCE

Electromagnetism Observation sheet Name VANDERBILT STUDENT VOLUNTEERS FOR SCIENCE http://studentorgs.vanderbilt.edu/vsvs Electromagnetism Spring 2016 (Adapted from Student Guide for Electric Snap Circuits

### Electromagnetic Induction and Faraday s Law

Electromagnetic Induction and Faraday s Law Solenoid Magnetic Field of a Current Loop Solenoids produce a strong magnetic field by combining several loops. A solenoid is a long, helically wound coil of

### 8.1 Magnetism. 8.2 Electricity and Magnetism. 8.3 Producing Electric Current. A Natural Light Show. BIG Idea. Science Journal

BIG Idea A magnet is surrounded by a magnetic field that exerts a force on other magnets. 8.1 Magnetism MAI Idea Like magnetic poles repel each other and unlike poles attract each other. 8.2 Electricity

### Chapter 22: Electric motors and electromagnetic induction

Chapter 22: Electric motors and electromagnetic induction The motor effect movement from electricity When a current is passed through a wire placed in a magnetic field a force is produced which acts on

### BELT-DRIVEN ALTERNATORS

CHAPTER 13 BELT-DRIVEN ALTERNATORS INTRODUCTION A generator is a machine that converts mechanical energy into electrical energy using the principle of magnetic induction. This principle is based on the

### What 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

### Current and Magnetism

105 Webster St. Hanover Massachusetts 02339 Tel. 781 878 1512 Fax 781 878 6708 Current and Magnetism Ground or Negative Black arrow shows current flow through the conductor Higher Voltage or Positive Overview

### a) Understand the conditions for lighting a light bulb by connecting it to batteries with wires to make it illuminate.

This area deals with simple electric circuits and electromagnets. In this area, students learn about electricity for the first time and build an electromagnet and a simple circuit to compare the brightness

### Magnetism 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,

### Electricity 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

### Farr 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

### CHAPTER 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

### National 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

### Fourth Grade Physical Science. Magnetism and Electricity. Written By: Hortencia Garcia Christina Mavaro Kathleen Tomscha

Fourth Grade Physical Science Magnetism and Electricity Written By: Hortencia Garcia Christina Mavaro Kathleen Tomscha Developed in Conjunction with K-12 Alliance/WestED Table of Contents 1 Conceptual

### Renewable Energy Systems 13

Renewable Energy Systems 13 Buchla, Kissell, Floyd Chapter Outline Generators 13 Buchla, Kissell, Floyd 13-1 MAGNETISM AND ELECTROMAGNETISM 13-2 DC GENERATORS 13-3 AC SYNCHRONOUS GENERATORS 13-4 AC INDUCTION

### Electricity and Magnetism (Demo Version) The pictures show different arrangements of a battery, a light bulb, and a piece of copper wire.

Read each question carefully. 1) The pictures show different arrangements of a battery, a light bulb, and a piece of copper wire. Which arrangement will light the bulb? 1 2) In which of the following circuits

QUESTIONSHEET 1 One mark for each of: when the pressure switch (A) is pushed, a current flows the electromagnet (B) is activated/switched on the armature (C) is attracted to the electromagnet the clapper

### Post-Show ELECTRICITY. After the Show. Traveling Science Shows

Traveling Science Shows Post-Show ELECTRICITY After the Show We recently presented an electricity show at your school, and thought you and your students might like to continue investigating this topic.

Name Section Date CONCEPTUAL PHYSICS Electromagnetic Induction: Generators and Alternating Current Tech Lab Electromagnetism Sim Faraday s Electromagnetic Lab Purpose To manipulate simulated magnets, compasses,