Advanced Science Primary 6 Energy

In the circuit shown, which switch(es) must be closed for ONLY Bulb L1 to light up?

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

Worked Solution

Step 1: Trace the path from the battery to L1. Step 2: The current must pass through the main switch S1 and the branch switch S2. Step 3: Closing S3 would light L2, which is not required.

Correct answer: S1 and S2

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