Standard Science Primary 5 Systems

Siti set up a circuit with two identical bulbs, B1 and B2, and two identical batteries. If she connects the bulbs in parallel instead of series, what will happen to the brightness of B1?

A B1 will remain at the same brightness.
B B1 will flicker and fuse.
C B1 will become dimmer.
D B1 will become brighter.
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Worked Solution

Step 1: In series, the total voltage of the batteries is shared between the bulbs. Step [2-9]: In parallel, each bulb branch receives the full voltage of the batteries. Step [2-9]: Higher voltage in the parallel branch makes B1 brighter than in the series circuit.

Correct answer: B1 will become brighter.

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