Standard Science Primary 5 Systems

Study the circuit diagram below. Which bulb(s) will light up when Switch S1 is closed and Switch S2 is open?

A Only B2
B Both B1 and B2
C Neither B1 nor B2
D Only B1
Show Worked Solution

Worked Solution

Step 1: Identify the circuit arrangement (parallel). Step [2-9]: Close S1; this completes the top branch for B1. Step [2-9]: S2 remains open; this leaves the bottom branch for B2 as an open circuit. Step [2-9]: Therefore, only B1 will light up.

Correct answer: Only B1

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