Advanced Science Primary 5 Systems

Look at the circuit diagrams. In which setup will the bulbs be the brightest?

A Setup A (2 bulbs in series)
B Setup B (2 bulbs in parallel)
C Setup C (3 bulbs in series)
D The brightness will be the same
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Worked Solution

Step 1: In a parallel circuit, each bulb receives the full voltage of the batteries. Step 2: In a series circuit, bulbs share the voltage and have higher total resistance. Step 3: Therefore, bulbs in parallel are brighter than those in series.

Correct answer: Setup B (2 bulbs in parallel)

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