Standard Science Primary 5 Systems

Study the circuit diagram below. What will happen to Bulb Y if Switch S1 is opened?

A Bulb Y will become brighter.
B Bulb Y will become dimmer.
C Bulb Y will go out.
D Bulb Y will remain lit.
Show Worked Solution

Worked Solution

Step 1: Identify the circuit type: Bulb X and Bulb Y are in a parallel arrangement. Step 2: Switch S1 is located on the branch containing Bulb X. Step 3: Opening Switch S1 breaks the circuit for Bulb X only. Step 4: Current can still flow from the battery through the independent branch containing Bulb Y, so Bulb Y remains lit.

Correct answer: Bulb Y will remain lit.

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