Standard Science Primary 6 Energy

Luke added a plastic ruler into a circuit gap. He noticed the bulb did not light up. Why?

A The battery is flat.
B The circuit is closed.
C Plastic is an electrical insulator.
D Plastic is an electrical conductor.
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Worked Solution

Step 1: Electricity needs a complete path of conductors to flow. Step 2: Insulators like plastic block the flow of electric current. Step 3: The circuit becomes open, so the bulb stays off.

Correct answer: Plastic is an electrical insulator.

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