Standard Science Primary 5 Systems

In the circuit shown, Bulb B2 and B3 are in parallel. What will happen to Bulb B1 if Bulb B2 fuses?

A Bulb B1 will go out.
B Bulb B1 will flicker.
C Bulb B1 will remain lit.
D Bulb B1 will become brighter.
Show Worked Solution

Worked Solution

Step 1: Fusing Bulb B2 breaks only that specific parallel branch. Step [2-9]: Current can still flow through the battery, Bulb B1, and the branch containing Bulb B3. Step [2-9]: Since a closed circuit remains for B1, it stays lit.

Correct answer: Bulb B1 will remain lit.

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