Electrical Induction

• All iron nails will fall

• some of the iron nails will fall

• All the nails will remain attracted

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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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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.

Can you produce current in a wire with a magnet that is sitting still?

• Yes; having a magnet near a wire is enough to excite the electrons

• No; the magnetic field has to be changing to excite the electrons

• No; magnets cannot create electricity

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Why is magnetic induction important?

• Electromagnets are very versatile

• Every electric motor uses induction

• Because it's an easy way to produce electricity

• All of the above

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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

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

• brighter

• stronger

• weaker

• invisible

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What is the principle behind electrical induction?

• Faraday's Law of Electromagnetic Induction

• Ohm's Law

• Coulomb's Law

• Newton's Third Law

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Which of the following devices operates on the principle of electromagnetic induction?

• Battery

• Transformer

• Resistor

• Capacitor

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In an experiment, a coil is moved through a magnetic field. What is observed?

• No current is induced

• A current is induced in the coil

• The coil heats up

• The magnetic field disappears

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