Unit 1 Review

Which of the following statements is most accurate for the image?

• This circuit will work because it is a closed circuit.

• Energy will freely flow in this circuit.

• This circuit will not work because there is no energy source.

• This circuit will not work because there is no switch.

Which statement is true?

• The light bulb will light up because the  circuit is complete.
• The light bulb will light up because the  circuit is broken.
• The light bulb will not light up because the  circuit is complete.
• The light bulb will not light up because the  circuit is broken.

What is the power source in this circuit?

• Bulb

• Switch

• Wire

• Battery

An incomplete circuit is shown.
To complete the circuit, a wire should be placed from —

• Point D to Point C
• Point B to Point C
• Point A to Point D
• Point B to Point D

Which bulbs will light?

• 1 and 2
• 2 and 3
• 3 and 4
• 4 and 2

Why is electrical wiring usually covered with a layer of plastic?

• To make it look pretty

• To help electricity flow along the wire

• To make it safe

• To add more energy

What is the function of the light bulb in a circuit?

• It increases the strength of the electricity.
• It changes electricity to light energy.
• It provides electricity to the battery.
• It opens and closes the circuit.

The circuit on the left is not complete (the light is off) because:

• the switch is closed

• the switch is open

• the battery is missing

• the battery is in backwards

A short circuit occurs when...

• There is an incomplete path of metal in a circuit

• There are too many light bulbs in the circuit

• The battery or energy source is only connected at one location

• There is a complete path in the circuit with no electrically powered device

Nonrenewable resources:

• are limited and cannot be replaced quickly.

• are unlimited and abundant.

• are always replenishing themselves (like solar, wind, and water).

• will never run out and generate no CO2.