Standard Science Primary 6 Energy

In the circuit shown, which switch(es) must be closed for only Bulb B1 to light up?

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

Worked Solution

Step 1: Identify S1 as the main switch. Step 2: Identify the parallel branches (B1 with S2, B2 with S3). Step 3: To light B1, both the main path (S1) and B1's specific branch (S2) must be closed.

Correct answer: S1 and S2

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