Electromagnets and Electric Motors

What is produced by moving a permanent magnet through a coil of copper wire?

• electricity

• electromagnet

• light

• sound

The process of generating the current in a conductor is called as 

• Electro motive force 

• Electromagnetic induction 

• generator energy conversion 

• induced voltage

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Which statement best explains the flow of energy through a motor?

• battery-->electrical current-->copper wire rotor -->magnet--> mechanical energy

• battery--> magnet--> electrical current--> copper wire rotor--> mechanical energy

• magnet--> mechanical energy--> copper wire rotor--> battery--> electrical current

• magnet--> copper wire rotor--> mechanical energy--> battery--> electrical current

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What is an advantage of electromagnets?

• They can be turned on and off.

• They are very strong.

• They can pick up heavy objects like cars.

• All of the above.

He was credited for his discovery of electromagnetic induction.

• Thomas Edison

• Benjamin Franklin

• Nikola Tesla

• Michael Faraday

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This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.

• Use a smaller battery.

• Reverse the poles of the magnet.

• Remove all the coils and the nail.

In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.

• wire, iron, electric

• electric, wire, iron

• iron, electric, wire

• excited, hair, apple

While electric current is flowing through a wire, what surrounds the wire?

• a magnetic field

• a glowing light

• neutrons

• protons

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What is most likely to happen when the switch is closed?

• magnetic field should be produced

• nail will rust

• battery will explode

• wire will catch on fire

Look at the picture what is letter A?

• Armature

• Commutator

• Permanent Magnet

• DC Source

• AC Source

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