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

What contribution did Thomas Edison make toward the study of electricity?

• He invented the light bulb

• He invented a generator that would produce electricity

• He discovered the nucleus of an atom

• He discovered that lightning is a form of electricity

A science class was completing an experiment on electrical circuits. Why did the bulb go out each time the switch was opened?

• Opening the switch broke the circuit

• The battery was probably going flat

• There was too much electricity flowing

• Opening the switch closed the circuit

Which would make the strongest electromagnet?

• A battery with 4 wire coils around a nail

• A battery with 6 wire coils around a nail

• A battery 10 wire coils around a nail

• A battery with 8 wire coils around a nail