Standard Science Primary 5 Systems

Study Circuit A below. What will happen to Bulb B2 if Bulb B1 fuses?

A Bulb B2 will become brighter.
B Bulb B2 will go out.
C Bulb B2 will flicker.
D Bulb B2 will remain lit with the same brightness.
Show Worked Solution

Worked Solution

Step 1: Observe that the battery and both bulbs are arranged in a single loop (series circuit). Step 2: In a series circuit, there is only one path for the electric current to flow. Step 3: If Bulb B1 fuses, the filament breaks, creating an open circuit. Step 4: Current cannot flow past B1 to reach B2, so B2 will go out.

Correct answer: Bulb B2 will go out.

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