Standard Science Primary 5 Systems

Study the circuit diagram below. If Bulb B1 fuses, what will happen to Bulb B2?

A Bulb B2 will stop lighting up.
B Bulb B2 will fuse as well.
C Bulb B2 will remain lit with the same brightness.
D Bulb B2 will become brighter.
Show Worked Solution

Worked Solution

Step 1: Observe that Bulb B1 and Bulb B2 are arranged in a single loop (series circuit). Step 2: When Bulb B1 fuses, the filament breaks, creating a gap in the circuit. Step 3: The circuit becomes open, and current can no longer flow to Bulb B2.

Correct answer: Bulb B2 will stop lighting up.

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