Why do computers have fans inside them?

• To produce more heat.

• To make them faster.

• To keep them from overheating.

• To make them lighter.

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What happens if a circuit is not closed?

• Electricity can still flow.

• No electricity flows.

• It produces more heat.

• It becomes more efficient.

What must be true for batteries in a circuit to function properly?

• They must face opposite directions.

• They should be removed when not in use.

• They must be aligned in the same direction.

• They must be of different types.

Why won't a light bulb glow if electricity passes by it instead of through it?

• Because it is too far from the battery.

• Because it needs more power.

• Because it is not part of the complete circuit.

• Because the bulb is defective.

What is necessary for a light bulb to glow in a circuit?

• Place the bulb near the battery.

• Use a plastic connector.

• Attach wires to one side of the bulb.

• Attach wires to both sides of the bulb.