Standard Science Primary 6 Energy

Why are electrical wires usually covered with plastic?

A To make the electricity flow faster.
B Because plastic is a good insulator of electricity.
C To keep the wires cool.
D Because plastic is a good conductor of electricity.
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Worked Solution

Step 1: Plastic does not allow electricity to pass through it. Step 2: This prevents people from getting electric shocks when touching the wires. Step 3: Plastic is an insulator.

Correct answer: Because plastic is a good insulator of electricity.

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