Standard Science Primary 5 Systems

Siti has a circuit with one battery and one bulb. She adds two more identical batteries in series. What will happen to the brightness of the bulb?

A The bulb brightness remains the same.
B The bulb will not light up.
C The bulb becomes much brighter.
D The bulb becomes dimmer.
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Worked Solution

Step 1: Adding batteries in series increases the electrical energy supplied. Step [2-9]: More energy means more current flowing through the filament. Step [2-9]: The bulb glows brighter (until it potentially fuses).

Correct answer: The bulb becomes much brighter.

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