Advanced Science Primary 5 Systems

In the circuit shown, which switches must be closed for ONLY Bulb 1 to light up?

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

Worked Solution

Step 1: Trace the path from the battery to Bulb 1. Step 2: Identify the switches on that specific path (S1 and S2). Step 3: If S3 remains open, Bulb 2 will not light up.

Correct answer: S1 and S2

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