Unit 7: Working with Electricity

Clayton tries to build an electric circuit using a battery, a light bulb, a paper clip, and copper wire. The diagram below shows what he builds. 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.

A simple electric circuit is shown below. When the paper clip is replaced with a wooden craft stick, the light bulb goes out. Which term best describes the craft stick?

• battery

• insulator

• generator

• conductor

The electric circuit below consists of a battery, a switch, and three light bulbs. 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.

In the electric circuit below, light bulbs are placed at A, B, and C. When the switch is closed, all three light bulbs are lit. 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.

Kishawn built the circuit shown below using a battery, a switch, and four light bulbs. He removed different combinations of light bulbs from the circuit and observed what happened. Based on 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

The illustration below shows a circuit that includes four light bulbs: A, B, C, and D. When the switch is closed, all of the light bulbs are on. 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.

In a light bulb, such as the one shown below, the filament glows brightly when the switch is turned 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

When the switch in the circuit below is closed, an electric circuit is completed. 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

• rubber band

• 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 follow. In a parallel circuit, there are two or more possible paths.