Standard Science Primary 5 Systems

Study the circuit diagram. What happens to the brightness of the bulbs if one more identical battery is added in series to the circuit?

A The bulbs will become dimmer.
B The bulbs will go out immediately.
C The bulbs will become brighter.
D The bulbs will remain the same brightness.
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Worked Solution

Step 1: Batteries in series increase the total electrical energy supplied. Step [2-9]: More electrical energy results in a higher current flowing through the bulbs. Step [2-9]: Higher current makes the bulbs glow brighter.

Correct answer: The bulbs will become brighter.

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