Unit 7 Test Review

What energy transformation occurs at the filament of a light bulb?

• potential energy into thermal energy and light energy

• chemical energy into light energy

• electrical energy into thermal energy and light energy

• light energy into electrical energy

Which of these materials is a conductor?

• craft stick

• plastic CD case

• rubber duck

• nail

What energy transformation occurs in an electric oven?

• electrical energy into energy of motion

• electrical energy into thermal energy

• thermal energy into electrical energy

• thermal energy into light energy

Skyler's Christmas lights had one bulb go out, but the rest remained lit. What reasoning explains why the broken bulb doesn't stop the electric current from flowing to other lights?

• The lights are part of a series circuit so they continue working.

• Electrons do not stop flowing when one part of a circuit breaks.

• Christmas lights do not use much electricity.

• The Christmas lights are in a parallel circuit so they continue to get current.

Jasiah builds the circuit shown. He removes bulb A then closes the switch. What will happen with bulb A removed and the switch closed?

• Bulbs B and C will go out.

• Bulbs B and C will remain lit.

• Bulb C will remain lit, and Bulb B will go out.

• Bulb B will remain lit and Bulb C will go out.

Which of the fllowing MUST be part of an electric circuit in order for it to work?

• light bulb or buzzer

• battery or other source of current

• copper wires

• switch or circuit breaker

What is the purpose of a circuit breaker?

• to shut off the current if a circuit is overloaded

• to natch the amount of current to what is needed

• to switch off a circuit when it is not being used

• to split electric current into different circuits

Cameron tries to build a circuit using a battery, a light bulb, and a paper clip. The diagram shows what he builds. Which reasoning explains why the light bulb does not light up?

• the paper clip stops the electric current

• the light bulb uses the electric current

• the circuit lacks a power source

• the circuit is not a complete loop

Look at the calculator shown. Which part of the calculator is the source of electric current?

• R

• S

• T

• W

When you plug in your lamp and turn it on, the light does not shine. Which of the following is a possible explanation for why the light is not coming on?

• You plugged the lamp into an open circuit.

• You plugged the lamp into a closed circuit.

• You plugged the lamp into a parallel circuit.

• You plugged the lamp into a series circuit.