Standard Science Primary 5 Systems

Study the circuit diagram carefully. Bulb B1 has fused. Which of the remaining bulbs will continue to light up?

A B3 only
B None of the bulbs
C Both B2 and B3
D B2 only
Show Worked Solution

Worked Solution

Step 1: Identify that the bulbs are arranged in a parallel circuit. Step 2: In a parallel circuit, current has multiple independent pathways to flow from the battery. Step 3: Bulb B1 fusing creates an open circuit only on the top branch. Step 4: Current can still flow through the middle branch (B2) and bottom branch (B3).

Correct answer: Both B2 and B3

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