Advanced Science Primary 5 Systems

Study the circuit diagram below. Bulbs B1 and B2 are lit. If Switch S1 is opened, what will happen to the bulbs?

A B2 will go out but B1 will stay lit.
B B1 will go out but B2 will stay lit.
C Both bulbs will remain lit.
D Both bulbs will go out.
Show Worked Solution

Worked Solution

Step 1: Identify the arrangement. The bulbs are in parallel branches. Step [2-9]: Switch S1 is on the same branch as B1. Step [2-9]: Opening S1 breaks the circuit for B1 only. B2 has an independent closed path to the battery.

Correct answer: B1 will go out but B2 will stay lit.

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