Electric Circuits

What makes up an electric circuit?

• Bulb and battery

• Bulb, battery and switch

• Bulb, battery and wire

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Why is a battery important in an electrical circuit?

• As a source of energy.

• As a path for electricity to flow through.

• As a connector to connect all parts of a circuit.

Why must parts of a circuit be properly connected before the bulb can light up?

• To ensure that the bulb can light up.

• To ensure that the battery can produce light in a closed circuit.

• To ensure that electric current can flow through the closed circuit.

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.

The diagram shows a complete circuit but the bulb did not light up. Why?

• The plastic spoon is an insulator of electricity and prevented electric current from flowing through the circuit.

• The plastic spoon is not connected properly and prevented electric current from flowing through the circuit.

• The plastic spoon is a conductor of electricity and prevented electric current from flowing through the circuit.

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Look at the diagram. When the switch is closed, the iron nail attracted the steel clips. Why?

• The iron nail produced electric current to attract the steel clips.

• The iron nail became a magnet and attracted the steel clips.

• The iron nail is a conductor of electric current in the circuit.

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

• Circuit A

• Circuit B

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

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.

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

• Circuit A

• Circuit B

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

State one advantage of bulbs arranged in parallel arrangement in a circuit.

• When one bulb fused the other can still light up.

• Reduce the amount of electric current used for both bulbs.

• Both bulbs in a parallel arrangement in circuit will share the electric current produced by the battery.