Standard Science Primary 5 Systems

Look at the circuit diagram. What will happen to Bulb Y if Bulb X fuses?

A Bulb Y will remain lit with the same brightness.
B Bulb Y will light up brighter.
C Bulb Y will become dimmer.
D Bulb Y will not light up.
Show Worked Solution

Worked Solution

Step 1: Identify the circuit arrangement. Bulb X and Bulb Y are connected in a single loop (series circuit). Step 2: If Bulb X fuses, the filament breaks, creating an open circuit. Step 3: Electric current cannot flow through the open circuit, so Bulb Y will not light up.

Correct answer: Bulb Y will not light up.

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