8.10 unit assessment

Observe the circuit below. If Bulb B burns out, what will happen to Bulb A?

• It will get brighter.

• It will get dimmer.

• It will stop working.

• It will stay the same.

What form of energy is associated with the movement of charges, usually electrons?

• chemical

• electrical

• heat

• sound

Which atomic particle carries a negative charge?

• proton

• neutron

• electron

• nucleus

Many electrical wires are wrapped with a plastic coating because plastic is _______.

• less expensive than steel

• denser than copper

• able to keep its shape

• a good insulator

A comb is rubbed with a piece of wool fabric and placed next to some scraps of paper. The paper moves toward the comb. What causes the paper to move?

• chemical energy

• magnetic attraction

• mechanical energy

• static electricity

The flow of electrons through a wire is called _______.

• current

• resistance

• static

• magnetism

Which of these materials is a good conductor of electricity?

• glass

• metal

• rubber

• newspaper

In order to turn off both lights, a switch must be installed in the circuit at the place marked ______.

• 1

• 2

• 3

• 4

In which direction do electrons flow in a circuit?

• From positive to negative

• From negative to positive

• In a circular motion

• Electrons do not flow

To demonstrate static electricity, a teacher takes an inflated balloon and rubs it against his hair. The rubber balloon picks up electrons from his hair, which makes his hair have __________.

• a) a net negative charge

• b) a magnetic force

• c) a net positive charge

• d) no charge