Week 35 - Chapter 25 Electromagnetism

Electromagnetism is magnetism produced by an electric current.

• true

• false

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A coil of wire with electric current flowing through it is called a(n) ____________.

• solenoid

• electromagnet

• electric motor

• electric generator

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A coil of wire with electric current flowing through it wrapped around a bar of iron or other ferromagnetic material is called a(n) ____________.

• solenoid

• electromagnet

• electric motor

• electric generator

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A device that uses an electromagnet to change electrical energy to kinetic energy is called a(n) ____________.

• solenoid

• electromagnet

• electric motor

• electric generator

A device that changes kinetic energy to electrical energy through electromagnetic induction is called a(n) ____________.

• solenoid

• electromagnet

• electric motor

• electric generator

Faraday’s law states what?

• An electric field produces a magnetic current, as long as the magnetic field is changing.

• An electric current is proportional to voltage and inversely proportional to resistance.

• A magnetic field produces an electric current, as long as the magnetic field is changing.

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What does a transformer do?

• It may either increase or decrease voltage.

• It may either increase or decrease current.

• It can only increase voltage.

• It always increases current.

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Which of these pairs of devices operate in reverse of each other?

• generator and motor
• generator and electromagnet
• motor and electromagnet
• electromagnet and resistor

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What do you make if you wrap a current-carrying wire around an iron bolt?

• electromagnet
• electric motor
• generator

How are electromagnets different from magnets?

• magnets can be turned on/off
• you can turn an electromagnet on/off
• magnets are more powerful
• magnets have a North and South pole

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