Electricity and Magnetism Study Guide

Which of the following is an example of a source of human-harnessed electricity?

• Getting a shock from a doorknob

• A hydroelectric dam

• Socks from the dryer sticking together

• Electricity and Magnetism

Which of the following correctly describes one way in which static electricity is different from the electricity used by humans to run things in their homes?

• Static electricity always goes in the same direction.

• Static electricity requires magnets and coils of wire.

• Static electricity flows at a constant rate.

• Static electricity is always a quick release of energy.

A few examples of electricity are shown below. Which of the examples shows how humans harness current electricity?

• Example 1 and Example 3

• Example 3 only

• Example 2 and Example 3

• Example 2 only

One way to know that lightning is an example of static electricity is because lightning.

• requires a metal surface

• is a quick release of energy

• moves toward magnets

Students construct a simple circuit and place an item in the path. All of the following materials will conduct electricity EXCEPT

• aluminum

• steel

• rubber

• copper

The students noticed that the buzzer was not making any sounds. What could be done to this circuit to make the buzzer work?

• Replace the buzzer with a smaller one.

• Close the switch to complete the circuit.

• Switch the wires to get a better connection.

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What object could be placed in the open space between the wires to complete the circuit?

• insulator
• toothpick

• eraser

• penny

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Electricity will flow in an electric circuit only if the circuit

• has several batteries

• makes a complete path

• produces light energy

• has the right kind of insulators

Which observation provides evidence that the magnet the students observed is an electromagnet?

• The magnet picks up paper clips.

• The magnet can be turned off and on.

• The magnet does not attract plastic.

• The magnet is not very heavy.

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The object will most likely still be attracted to the magnet if which change is made?

• The glass is replaced with a thick piece of wood.

• The magnet is moved much farther away from the glass.

• The glass is replaced with a piece of paper.

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