Electricity and Magnetism Exam 4 Review

Motors and generators contain similar parts. In both, a wire loop is placed in a magnetic field. Which of the following statements about motors and generators is correct?

• The wire loop in a motor is mechanically turned producing a current.

• In a generator, a current is passed through a wire loop causing it to rotate.

• A motor rotates in only one direction producing alternating current.

• A generator uses electromagnetic induction to produce a current.

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NGSS.HS-PS2-5

This picture shows how to make an electromagnet. Which of these would make the electromagnet strongest?

• Using a longer wire from the battery to the nail

• Wrapping the wire around the nail more times

• Wrapping the wire around a nonmetallic object

• Making the loops of wire less tightly coiled

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

Nuclear energy is considered an important source of energy for the future because it -

• releases a large amount of energy

• releases thermal energy as a byproduct of reaction

• produces waste that does not harm the environment

• is a renewable resource

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NGSS.HS-ESS3-2

Which of the following is an example of static electricity?

• A dry-cell battery connected to wires lights up a light bulb.

• A balloon sticks to a wall after it is rubbed with a piece of wool.

• A magnet sticks to a refrigerator door made of metal.

• A light switch that is turned on runs a ceiling fan.

The diagram below shows an incomplete circuit. Which item would allow the bulb to light up if it were used to connect point A to point B?

• A glass rod

• A metal coin

• A plastic comb

• A paper cup

Assuming the resistance stays the same, how are current and voltage related?

• When voltage increases, current decreases.

• When voltage increases, current increases.

• When voltage increases, the current is not affected.

• The two measures of electrical energy are not related.

According to these data, which material is the poorest electrical conductor?

• Glass

• Steel

• Aluminum

• Pencil lead

Label the different parts of the circuit.

b

a

c

d

Device

Switch

Energy Source

Wire

A circuit has to be​ (a)   in order to produce electricity.​ ​

• open
• parallel
• closed
• vertical

​ (a)   is the flow of electricity. The path the electrons take is a ​ (b)   . A ​ (c)   ​circuit has only one path for the electrons. A ​ (d)   ​ circuit has more than one path for the electrons.

• current
• circuit
• series
• parallel