Chapter 17Physics A First Course Electricity and Magnetism

Electricity and MagnetismElectromagnets and

Induction17.1 Electric Current and Magnetism

17.2 Electric Motors

17.3 Electric Generators and Transformers

17A Investigation: Electromagnetic ForcesKey Question:

How does an electric motor work?

*Students read text section 17.1 AFTER Investigation 17A

17A Investigation Topics

Assemble parts of an electric motor.

Wrap copper wire for coil of an electric motor.

Calculate the speed of each electric motor.

Chapter 17.1 Objectives and Vocabulary

coil solenoid

Describe the effect an electric current in a wire has on a compass.

Explain how to change the strength and direction of a wire's magnetic field.

Determine whether two wires or coils will attract or repel.

Effect of current on compasses

Chapter 17.2 Objectives and Vocabulary electric motor

rotor commutator armature brushes

Describe the role of magnets in electric motors.

Explain how electric motors operate.

Learn the main THREE parts of an electric motor.

Explain how a battery-powered motor works.

17B Investigation: Electromagnetic InductionKey Question:

How does an electric generator work?

*Students read text section 17.3

AFTER Investigation 17B

17B Investigation Topics Physically power an electric generator.

Create AC electricity.

Calculate the voltage generated.

Measure and calculate speed of generator.

Graph voltage vs. speed for generator.

Experiment with varying generator configurations.

Evaluate different generator configurations.

Chapter 17.3 Objectives and Vocabulary electromagnetic

induction Faraday's law of

induction generator

Explain how a magnet can be used to produce current in a coil.

Describe the design of a simple generator.

Calculate the number of turns or voltage of a coil in a transformer.