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Physics A First Course Electricity and Magnetism Chapter 17

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**Electricity and Magnetism Electromagnets and Induction**

17.1 Electric Current and Magnetism 17.2 Electric Motors 17.3 Electric Generators and Transformers

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**17A Investigation: Electromagnetic Forces**

Key Question: How does an electric motor work? *Students read text section 17.1 AFTER Investigation 17A

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**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.

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**Chapter 17.1 Objectives and Vocabulary**

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. coil solenoid

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**Effect of current on compasses**

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**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.

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**17B Investigation: Electromagnetic Induction**

Key Question: How does an electric generator work? *Students read text section 17.3 AFTER Investigation 17B

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**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.

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**Chapter 17.3 Objectives and Vocabulary**

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. electromagnetic induction Faraday's law of induction generator

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