Advanced Science Primary 5 Systems

Ravi tested four objects (P, Q, R, S) in a circuit. Only when objects P and R were used did the bulb light up. What can be concluded?

A Only R is a conductor.
B All four are insulators.
C P and R are electrical conductors.
D Q and S are electrical conductors.
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Worked Solution

Step 1: A bulb lights up only if the circuit is closed. Step 2: Conductors allow electricity to flow; insulators do not. Step 3: Since the bulb lit with P and R, they must be conductors.

Correct answer: P and R are electrical conductors.

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