Standard Science Primary 5 Systems

Siti set up the circuit shown below. When she closed the switch, she noticed that only one bulb lit up. Which of the following could be the reason?

A The wires were not insulated.
B One of the bulbs was fused.
C The switch was made of plastic.
D One of the batteries was placed in the wrong direction.
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Worked Solution

Step 1: In a parallel circuit, if one bulb lights up but the other doesn't, the path for the unlit bulb is broken. Step 2: A fused bulb creates a gap in its specific branch. Step 3: Therefore, only the bulb in the complete branch lights up.

Correct answer: One of the bulbs was fused.

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