Ch. 20.2 - Electric Current

Ch. 20.2

Electric Current

Multiple Choice

What is electric current?

• the amount of force placed on a charge

• a continuous flow of electric charge

• the amount of friction inside a material

• the temperature of a material

Multiple Choice

What is an electrical conductor?

• a material that allows electric charges to flow through it

• a material that does NOT allow electric charges to flow through it

• a material that can allow charges to flow through it sometimes, but other times it doesn't

• a material that is specifically made out of metal

Multiple Choice

What is an electrical insulator?

• a material that allows electric charges to flow through it

• a material that does NOT allow electric charges to flow through it

• a material that can allow charges to flow through it sometimes, but other times it doesn't

• a material that is specifically made out of rubber

Multiple Choice

True or False? Metals are good conductors

• True

• False

Multiple Select

Mark each material that would be a conductor.

• Copper

• Plastic

• Rubber

• Silver

• Wood

Multiple Select

Mark each material that would be an insulator.

• Copper

• Plastic

• Rubber

• Silver

• Wood

Multiple Select

Select each factor that would affect a material's resistance.

• its length

• its velocity

• its temperature

• its thickness

Multiple Choice

True or False? Three common voltage sources are batteries, solar panels, and generators.

• True

• False

Multiple Choice

True or False? According to Ohm's law, the voltage in a circuit equals the product of the energy and the resistance.

• True

• False

Fill in the Blanks

Doubling the voltage in a circuit doubles the current if the

is held constant.

Multiple Choice

True or False? Doubling the resistance in a circuit will halve the current if voltage is held constant.

• True

• False