Electric Current

Electric current will flow through a conductor if there is a difference in potential between the ends of the conductor.

• True

• False

The electricity we buy from a power company is DC current

• False

• True

Answer explanation

It is AC (alternating current)

Which kind of current only flows in one direction?

• Direct Current

• Alternating Current

Which kind of current constantly changes direction?

• Direct Current

• Alternating Current

The opposition to the flow of electric current is called ____.

• electrical resistance

• voltage

• coulombs

• electrical power

All metals have the same amount of electrical resistance.

• True

• False

Answer explanation

Iron has more than 5 times as much resistance as copper.

Insulators have very little electrical resistance.

• True

• False

Answer explanation

Insulators have a large amount of electrical resistance so it is very difficult for current to flow through them.

Resistance is used to control the amount of current in electronics.

• True

• False

Which statement is true?

• Thick wire has more resistance than thin wire

• Thin wire has more resistance than thick wire

• The thickness of wire does not affect its resistance

Answer explanation

Thick wire gives more room for current to flow so it is hindered less than flowing through thin wire.

In a ____ circuit, current flows along a single path

• series

• parallel

• combination series/parallel