Electromagnetic Induction Review

How do you make an electromagnet stronger?

• Add a motor and/or lightbulbs
• Add more light bulbs and/or wire coils
• add more wire coils and/or a switch
• add more wire coils and/or batteries

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Like poles on a magnet

• attract
• repel

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• All iron nails will fall

• some of the iron nails will fall

• All the nails will remain attracted

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Voltage can be induced in a wire by

• moving the wire near a magnet.

• moving a magnet near the wire.

• changing the current in a nearby wire.

• all of these

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What would happen if I move a bar magnet in and out of a coil of copper wire?

• Electric current would disappear 
• The magnet would explode 
• Electric current will flow through the wire
• It would produce a gravitational field

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What is one way to increase the current in a wire?

• Decrease the number of coils
• Increase the number of coils
• Move the magnet slower
• Take the wire off of the magnet

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A __________ is an electrical device that converts AC electricity from one voltage level to another

• transformer

• primary coil

• secondary coil

• center tap

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Will a transformer work with direct current (d.c.) or alternating current (a.c.)?

• a.c. only
• d.c. only
• Both a.c. and d.c.

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If you wrap more coils around an electromagnet, it will become...

• brighter
• stronger
• weaker
• invisible

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If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil with twice the number of loops,

• one-half as much voltage is induced.

• the same voltage is induced.

• twice as much voltage is induced.

• four times as much voltage is induced.

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