Standard Science Primary 6 Energy

Siti has two identical circuits, A and B. Circuit A has two bulbs in series, while Circuit B has two bulbs in parallel. Both circuits use the same number of identical batteries. Which of the following is true?

A The bulbs in Circuit B are brighter than in Circuit A.
B The bulbs in Circuit A are brighter than in Circuit B.
C The batteries in Circuit B will last longer than in Circuit A.
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 a parallel circuit, each bulb receives the full voltage of the battery. Step 3: In a series circuit, voltage is shared between bulbs. Step 4: Therefore, parallel bulbs (Circuit B) are brighter.

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

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