Standard Science Primary 5 Systems

Study the circuit diagram. Bulb X is fused. What will happen to Bulb Y?

A Bulb Y will flicker.
B Bulb Y will remain lit normally.
C Bulb Y will become brighter.
D Bulb Y will go out.
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Worked Solution

Step 1: Identify the arrangement. The bulbs are in a series circuit (one single pathway). Step 2: A fused bulb breaks the circuit, creating an open circuit. Step 3: Electric current cannot flow through an open circuit, so Bulb Y will not light up.

Correct answer: Bulb Y will go out.

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