Standard Science Primary 5 Systems

A circuit is set up with a battery, a bulb, and a plastic-coated wire. If the plastic is not stripped off the ends of the wire before connecting, will the bulb light up?

A Yes, because electricity flows through the plastic.
B No, because the battery is too weak.
C Yes, because the metal inside is still there.
D No, because plastic is an insulator.
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Worked Solution

Step 1: Electricity needs a continuous path of conducting material. Step 2: Plastic is an insulator and blocks the flow of current. Step 3: Without the metal-to-terminal contact, the circuit remains open.

Correct answer: No, because plastic is an insulator.

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