conductors and insulators

Front

Why are metals good conductors of electricity?

Back

In metals there are many free electrons.

Front

In metals, free electrons are electrons that...

Back

escape from the atom and move freely in the metal

Front

What happens to the air when lightning occurs? Options: generate an electric current, glow, become a conductive material, heated up.

Back

become a conductive material

Front

Conductors are substances:

• capable of passing current
• capable of allowing positively charged particles to pass through
• capable of allowing negatively charged particles to pass through

Back

All of the above are correct.

Front

Which of the following objects is an insulator? Glass, rubber, wood, Iron, copper, aluminum, Salt water, lemon juice, Gold and silver

Back

Glass, rubber, wood

Front

Arrange the substances according to their increasing ability of good electrical insulators: Air, plastic, porcelain, Distilled water, glass, plastic, Rubber, dry wood, porcelain, Air, glass, plastic.

Back

Air, plastic, porcelain

Front

Which of the following materials is an insulator? Wood, Copper, Iron, Aluminum

Back

Wood

Front

When doing electrical repairs in the house, Poles often stand on wooden or plastic chairs. Why?

Back

All three sentences are correct

Front

Why are electric wire cores usually made of copper?

Back

Copper is easy to spin, malleable, conducts electricity well, and is a fairly common material with a reasonable price compared to other good conductive materials.

Front

Arrange substances according to their increasing ability to conduct electricity: Common water, graphite, gold

Back

Common water, graphite, gold