Standard Science Primary 5 Systems

Study the circuit diagram below. Bulb B1 and Bulb B2 are identical. What will happen to Bulb B2 if Bulb B1 fuses?

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

Worked Solution

Step 1: Identify the arrangement. The bulbs are in a 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 path is broken (open circuit). Step 4: Current cannot reach Bulb B2, so it will go out.

Correct answer: Bulb B2 will go out.

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