Standard Science Primary 5 Systems

Siti set up the circuit shown below. If Bulb B1 fuses, what will happen to Bulb B2 and Bulb B3?

A B2 will go out but B3 will remain lit.
B Both B2 and B3 will go out.
C Both B2 and B3 will remain lit.
D B2 will remain lit but B3 will go out.
Show Worked Solution

Worked Solution

Step 1: Identify that B1 and B2 are in series with each other. Step 2: Identify that B3 is in parallel to the branch containing B1 and B2. Step 3: If B1 fuses, the path for B2 is broken. B3 still has a complete circuit path.

Correct answer: B2 will go out but B3 will remain lit.

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