How does an electric motor work?

Electric motors are devices that convert ____ energy into ___ energy.

• electrical; mechanical

• chemical; potential

• mechanical; electrical

• mechanical; kinetic

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What is formed when a wire in an electric circuit is wrapped around an iron core producing a magnetic field?

• electromagnet

• magnet

• generator

• electric motor

The flow of electric charge in a circuit is called ____.

• heat

• electric current

• sound

• magnetic

Like magnetic poles push each other away

• true

• false

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A magnet must always have two poles, even if cut in half, because

• A magnet is made up of tiny magnetic domains that are aligned.

• Magnetic domains are out of alignment.

• Each pole divides in half and the magnetic field becomes weaker.

A type of magnet that has temporary magnetic effect when electric current flows through it.

This refers to...

• Electric

• Electrostatic

• Electronic

• Electromagnet

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An electromagnet differs from a permanent magnet because

• permanent magnets require an electrical current to produce a field

• electromagnets only have one pole, while permanent magnets always have two.

• electromagnets can be turned off or weakened by reducing to stopping the flow of current.

• permanent magnets require the movement of electrons, while electromagnets do now.

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What component becomes a temporary magnet when electricity is flowing through the circuit?

• iron nail

• battery

• copper wire

• switch

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What component provides the pathway to carry electricity from component to component?

• battery

• switch

• wire

• iron nail

Which best describes how a motor works?

• When a fan blows on a wire, it causes it to spin, creating a force.

• When a wire that carries electrical current is placed in zero gravity, the wire experiences a force.

• When a fan blows on a wire, it cases it to spin, creating an electrical current.

• When a wire that carries electrical current is placed in a magnetic field, the wire experiences a force.

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NGSS.HS-PS2-5

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