Standard Science Primary 5 Systems

Siti set up two circuits, A and B. In Circuit A, three bulbs are arranged in series. In Circuit B, three identical bulbs are arranged in parallel. If one bulb in each circuit fuses, what will happen?

A Two bulbs in A will remain lit; all bulbs in B will go out.
B All bulbs in both circuits will go out.
C All bulbs in A will go out; two bulbs in B will remain lit.
D All bulbs in both circuits will remain lit.
Show Worked Solution

Worked Solution

Step 1: Identify circuit types (Series vs Parallel). Step 2: In series (Circuit A), a fused bulb breaks the circuit path. Step 3: In parallel (Circuit B), each bulb is on its own branch. Step 4: Only A is fully interrupted.

Correct answer: All bulbs in A will go out; two bulbs in B will remain lit.

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