HMH Unit 7 Review

Which claim best explains why the circuit would not conduct electricity?

• The circuit lacks a power source.

• The circuit is not a complete loop.

• The light bulb uses the electric current.

• The paper clip stops the electric current.

Which term best describes the craft stick?

• battery

• insulator

• generator

• conductor

What will happen if the switch is closed and bulb A is removed?

• Bulbs B and C will go out.

• Bulbs B and C will remain lit.

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

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

What happens to Bulbs A and C if Bulb B burns out?

• Both bulbs A and C will go out.

• Bulb A will go out but bulb C will stay lit.

• Bulb C will go out but bulb A will stay lit.

• Both bulbs A and C will stay lit.

Based on the evidence in the diagram, which combination of light bulb removal will cause the other light bulbs to go out?

• A and B

• B and C

• D only

• B only

What happens to bulbs A and D if bulbs B and C are removed?

• Bulb A goes out.

• Bulb D goes out.

• Bulbs A and D go out.

• Bulbs A and D stay on.

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

• chemical energy into light energy

• light energy into electrical energy

• potential energy into thermal energy and light energy

• electrical energy into thermal energy and light energy

Which devices will come on when the switch is closed?

• buzzer only

• electric motor only

• buzzer, electric motor, and light bulb

• buzzer and electric motor but not light bulb

Some materials conduct electricity, but others do not. Which of these materials is an electrical conductor?

• nail

• plastic ruler

• rubberband

• toothpick

There are two main types of electric circuits: series circuits and parallel circuits. Which claim describes how a series circuit is different from parallel circuits?

• A series circuit provides current to one or two devices. A parallel circuit provides current to many devices.

• In a series circuit, current flows in one direction. In a parallel circuit, current flows in both directions.

• A series circuit uses electrical energy from a battery. A parallel circuit uses current from an outlet or generator.

• In a series circuit, there is only one possible path that current can flow. In a parallel circuit, there are two or more possible paths.