Chapter 21: Electromagnetism

Which is not a way to strengthen an electromagnet?

• Increase current

• Use a plastic wire

• Use a bigger magnetic material

• Wrap the wire around the magnetic material more times.

What does this image show?

• Parallel circuit

• Series circuit

• Magnet

• Electromagnet

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The area of magnetic force around a magnet is known as its ____________.

• magnetism

• magnetic current

• magnetic field

• electric current

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A _______________ is a current-carrying coil of wire with many loops.

• magnet

• electromagnet

• solenoid

• compass

How can a magnet be used to produce an electric current?

• Hold a magnet next to a piece of wire.

• Wrap wire around a magnet.

• Spin the magnet around inside a coil of wire.

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A _____________ transforms mechanical energy into electrical energy.

• generator

• electromagnet

• electric motor

• magnetic field

Increasing the number of coils in an electromagnet will _________ the power of the magnet.

• decrease

• increase

• not affect

What kind of magnet can be turned on and off?

• refrigerator magnet

• electromagnet

• magnetite

• iron

A compass needle responds to a magnetic field, because the compass needle is a

• generator.

• motor.

• magnet.

• transformer.

A device that increases or decreases the voltage of alternating current

• electric motor

• galvanometer

• transformer

• generator