electricity

Why do electricians always wrap wires in plastic?

• Plastic comes in many different colors

• Plastic is a good electrical conductor

• Plastic makes the wires easy to bend

• Plastic is a good electrical insulator

Which of these materials is a good conductor of electricity?

• Rubber

• Metal

• Newspaper

• Glass

The student conducted an experiment with circuits. Why was the bulb bright when he closed the switch?

• The switch produced an electric current

• Closing the switch broke the circuit

• Closing the switch completed the circuit

• The switch did not make a difference

Which of the following items would conduct electricity?

• Aluminum ladder

• Metal screwdriver

• Wooden baseball bat

• Rubber flip flops

How can it be explained that someone's hair can stick to a balloon?

• There is static electricity

• There is too much dust in the air

• A parallel circuit was too long

• The person needs to wash his hair

A penny is an example of

• An insulator

• an electron

• a proton

• a conductor

which of the following materials are best used as insulators?

• Wood

• Rubber

• Metal

• Plastic

The student arrived home and turned on a light switch, so she could see how to get to her bedroom. The switch allowed electricity to flow and was transformed into-

• Light energy

• mechanical energy

• superior energy

• radiant energy

In this picture, the iron filings show the shape of the magnetic -

• pole

• core

• field

• axis

Which contribution toward understanding electricity was made by Michael Faraday?

• Created the first electric power generator

• Discovered that lightning carried electricity

• Concentrated on mass-producing long-lasting light bulbs

• Improved the telegraph system