Standard Science Primary 5 Systems

Study the circuit diagram below. Bulb B2 has fused. Which of the following bulbs will remain lit?

A None of the bulbs
B Bulbs B1 and B3
C Bulb B3 only
D Bulb B1 only
Show Worked Solution

Worked Solution

Step 1: Identify the circuit arrangement. The bulbs are in a parallel circuit. Step 2: In a parallel circuit, there are multiple independent paths for the current to flow. Step 3: If Bulb B2 fuses, only the middle branch becomes an open circuit. Step 4: Current can still flow through the top branch (B1) and bottom branch (B3).

Correct answer: Bulbs B1 and B3

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