Standard Science Primary 5 Systems

Look at the mixed circuit diagram below. If Bulb B1 fuses, what will happen to Bulb B2 and Bulb B3?

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

Worked Solution

Step 1: Bulb B1 is located on the main series loop, before the circuit splits into parallel branches. Step 2: All current from the battery must pass through Bulb B1 to reach Bulb B2 and Bulb B3. Step 3: If Bulb B1 fuses, the main circuit is broken. Step 4: No current can flow to the parallel branches, so both Bulb B2 and Bulb B3 will go out.

Correct answer: Both Bulb B2 and Bulb B3 will go out.

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