Standard Science Primary 5 Systems

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

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

Worked Solution

Step 1: Trace the path from the battery to Bulb L1. Step 2: Identify the switches that interrupt this specific path. Step 3: Switches S1 and S2 must both be closed to create a continuous loop for L1.

Correct answer: Switch S1 and S2

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