Standard Science Primary 6 Energy

Look at the circuit diagram. If Switch S1 is open and S2 is closed, which bulb(s) will light up?

A Bulb B1 only
B Both bulbs
C Bulb B2 only
D Neither bulb
Show Worked Solution

Worked Solution

Step 1: Trace the path from the battery. Step 2: An open switch breaks the circuit for that specific path. Step 3: Bulb B2 is on a closed path, so it lights up.

Correct answer: Bulb B2 only

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