Advanced Science Primary 5 Systems

Study the circuit diagram. If Bulb B1 is on the main circuit and Bulbs B2 and B3 are in parallel branches, what will happen if Bulb B2 fuses?

A Bulb B1 will remain lit but B3 will go out.
B Bulbs B1 and B3 will remain lit.
C Bulbs B1 and B3 will go out.
D All bulbs will go out.
Show Worked Solution

Worked Solution

Step 1: Identify the circuit arrangement as mixed. Step [2-9]: B2 and B3 are in parallel. If B2 fuses, that specific branch is open. Step [2-9]: Current can still flow through the main path (B1) and the other parallel branch (B3).

Correct answer: Bulbs B1 and B3 will remain lit.

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