electric circuits

What makes up an electric circuit?

• Bulb and battery

• Bulb, battery and switch

• Bulb, battery and wire

Look at the diagram. Why did the bulb not light up?

• The bulb was fused.

• The battery had not enough electric current to light up the bulb.

• The switch was opened and prevented electric current from flowing through the circuit.

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Look at the circuits in the diagram. In which circuit will the bulb be brighter?

• Circuit C

• Circuit D

• Both circuits, the bulbs will have the same brightness.

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What is a conductor?

•  A material that allows electricity to flow through it.  The circuit is complete. 
• A material that does not allow electricity to flow through.  It stops the flow of electricity.
• A light switch.

An example of an insulator is?

• metal
• plastic
• brass
• aluminum

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Why electrical wiring usually are 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

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Why is electrical wiring usually made from copper?

• Because copper is shiny

• Because copper conducts electricity

• Because copper is not magnetic

• Because copper insulate electricity

Which of the following materials is an electrical conductor?

• Silver spoon

• Silver-colored plastic spoon

• cooper spoon

• wooden spoon

This is the symbol for a _____?

• switch
• light 
• battery
• wires

This is the symbol for a _____?

• an AC current source
• a DC current source
• a battery
• a single cell