Standard Science Primary 6 Energy

Siti has two circuits, X and Y. Circuit X has two bulbs in series, and Circuit Y has two bulbs in parallel. Both circuits use identical batteries and bulbs. Which statement is correct?

A The bulbs in Circuit Y are brighter than in Circuit X.
B The bulbs in Circuit X are brighter than in Circuit Y.
C If one bulb in Circuit X fuses, the other bulb stays lit.
D The bulbs in both circuits have the same brightness.
Show Worked Solution

Worked Solution

Step 1: In a parallel circuit (Y), each bulb receives the full voltage of the battery. Step 2: In a series circuit (X), the voltage is shared between the bulbs. Step 3: Therefore, bulbs in parallel are brighter than those in series.

Correct answer: The bulbs in Circuit Y are brighter than in Circuit X.

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