Standard Science Primary 5 Systems

Siti set up two circuits, A and B. In Circuit A, two bulbs are arranged in series. In Circuit B, two identical bulbs are arranged in parallel. If all batteries and bulbs are identical, which of the following is TRUE?

A The bulbs in Circuit B are brighter than in Circuit A.
B If one bulb in Circuit B fuses, the other bulb will go out.
C The bulbs in Circuit A are brighter than in Circuit B.
D The bulbs in both circuits have the same brightness.
Show Worked Solution

Worked Solution

Step 1: Identify the arrangements (Series vs Parallel). Step 2: In series, current is shared across components. In parallel, each branch receives full voltage. Step 3: Parallel bulbs (Circuit B) will be brighter than series bulbs (Circuit A).

Correct answer: The bulbs in Circuit B are brighter than in Circuit A.

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