Standard Science Primary 5 Systems

Siti tested four materials (A, B, C, D) by placing them in a circuit. The bulb lit up for A and C, but not for B and D. Which conclusion is correct?

A A and C are electrical conductors.
B B and D are electrical conductors.
C A and C are electrical insulators.
D B and D allow electricity to pass through.
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Worked Solution

Step 1: A material that allows electricity to pass is a conductor. Step 2: If the bulb lights up, the material has closed the circuit. Step 3: Therefore, A and C are conductors.

Correct answer: A and C are electrical conductors.

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