Electricity Review

Which one of these materials is a conductor?

• rubber

• plastic

• copper

• glass

What is one use for an insulator?

• It slows down the flow of electric current to produce heat and light

• It stores electric energy for later use

• It makes electrically charged objects safer to handle

• It allows electric energy to flow through it

Electric current CANNOT flow in a series circuit if...

• The circuit contains an insulator

• there is a break in the circuit

• the circuit contains a resistor

• the circuit has only one loop in it

What happens in a parallel circuit if one of the loops is broken?

• The electric current will not flow through any of the loops

• The electric current will only flow through the broken loop

• The electric current will still flow through the unbroken loop

• The energy source will stop

Which of the following is caused by the energy of motion and transfer of heat?

• friction

• resistor

• filament

• conductor

An example of a resistor is ...

• a light bulb

• a power cord

• a battery

• a parallel circuit

Which of the following uses resistors to transform electricity into heat?

• a car engine

• a gas fireplace

• a hair dryer

• a bike

How does a filament in an light bulb produce light?

• The filament gets hot as electrical energy flows through it.

• The filament blocks all electricity from flowing through it.

• The filament allows electricity to flow through it easily.

• The filament gets cold as electrical energy flows through it

A washing machine is an example of transforming

• motion energy into electrical energy

• electrical energy into light energy

• electrical energy into motion energy

• sound energy into light energy

Explain what will happen to this circuit if a rubber eraser is placed between the battery and one of the wires connected to it.

• The electrical current would continue to flow through the rubber eraser

• Nothing would happen and the light would still go on

• The electrical current would no longer flow through the circuit, because the eraser would act as an insulator and stop the flow of electrical current.

• The battery would over heat