Electricity and Magnetism

Which is NOT needed to form an electric circuit?

• a source
• a switch
• a receiver
• a conductor

How can an electric circuit be most easily interrupted?

• by cutting the energy conductor/power source
• by increasing the energy source
• by adding another energy receiver
• by using a smaller energy receiver

Which is an example of an energy source in an electric circuit?

• a  battery
• insulation
• a light bulb
• copper wire

Which is a correct statement about lights that are part of a series circuit?

• The lights will flash on and off in a pattern.
• If one light burns out, the others will go out.
• If one light burns out, the others will stay lit.
• Two switches are needed to turn the lights on and off.

The diagram below shows an electric circuit. Which explains why this circuit will NOT work?

• It has no energy source.
• It has no energy conductor.
• The energy receiver is too small.
• The energy pathway is not closed.

Which type of circuit would be best for a string of holiday lights so that if one bulb burns out, the rest of the lights will stay on?

• short circuit
• series circuit
• parallel circuit
• magnetic circuit

In which circuit will the light(s) be on? A, B, C, or D?

• A
• B
• C
• D

What happens when a light switch is turned off?

• The circuit is closed, the electricity is stopped, and the light is on.
• The circuit is opened, the electricity is stopped, and the light is off.
• The circuit is opened, the electricity flows through the bulb, and the light is on.
• The circuit is closed, the electricity flows through the bulb, and the light is on.

A student wants to block the flow of electricity. Which substance would be best?

• aluminum
• copper
• iron
• rubber

How is an electromagnet different from a permanent magnet?

• An electromagnet is smaller and less powerful.
• An electromagnet's magnetism can be turned off.
• An electromagnet can be built without using metal.
• An electromagnet does not attract objects containing iron.