Electricity Basics

What happens when two objects are rubbed together and charged by friction?

• They both lose electrons.

• They both gain electrons.

• One object gains electrons, while the other loses electrons.

• Nothing happens.

Which of the following materials is a good conductor of electricity?

• Rubber

• Glass

• Copper

• Wood

What is the main characteristic of an insulator?

• It allows electricity to flow through it easily.

• It holds its electrons loosely.

• It does not allow electricity to flow through it easily.

• It can become charged by induction very easily.

Charging by contact involves:

• Transferring charge without touching.

• Only insulators being charged.

• Direct physical contact between two objects.

• Charging objects by rubbing them together.

An object that has a HIGH electron affinity will:

• lose electrons

• gain electrons

• share electrons

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Which of the following is an example of an insulator?

• Iron

• Aluminum foil

• Plastic

• Silver

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In the process of charging by contact, if a charged rod touches a neutral sphere, what happens to the sphere?

• It becomes positively charged.

• It becomes negatively charged.

• It remains neutral.

• It acquires the same type of charge as the rod.

What is the principle behind charging by induction?

• Direct transfer of electrons from one object to another

• Creating a charge in a neutral object without direct contact

• Using a grounding wire to transfer charge

• Rubbing two objects together to transfer charge

True or false: charging by induction will cause a temporary charge

• True

• False

True or False: Tap water is an insulator

• True

• False

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