Standard Science Primary 5 Systems

Study the circuit diagram below. What will happen to Bulb Y if Bulb X fuses?

A Bulb Y will also fuse.
B Bulb Y will flash continuously.
C Bulb Y will go out.
D Bulb Y will remain lit.
Show Worked Solution

Worked Solution

Step 1: Identify that Bulbs X and Y are arranged in parallel. Step 2: In a parallel circuit, there are multiple pathways for current to flow. Step 3: If Bulb X fuses, its specific branch is open, but Bulb Y still has a closed loop connecting it to the battery. Step 4: Bulb Y will remain lit.

Correct answer: Bulb Y will remain lit.

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