Standard Science Primary 5 Systems

Study the circuit. Which switches must be CLOSED for only Bulb L1 and Bulb L2 to light up?

A S1 and S3
B S1 and S2
C S2 and S3
D S1, S2 and S3
Show Worked Solution

Worked Solution

Step 1: Trace the path from the battery to L1 and L2. Step 2: Identify which switches lie on those specific paths. Step 3: Closing S1 and S2 completes the circuit for those two bulbs.

Correct answer: S1 and S2

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