Advanced Science Primary 5 Systems

Ravi has a circuit with one battery and two bulbs in parallel. If he adds a second battery in series with the first, what happens to the brightness of the bulbs?

A One bulb becomes brighter while the other stays the same.
B The brightness remains unchanged for both.
C Both bulbs become brighter.
D Both bulbs become dimmer.
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Worked Solution

Step 1: Batteries in series increase the total voltage of the circuit. Step [2-9]: In a parallel circuit, each branch receives the full voltage of the battery source. Step [2-9]: Increased voltage leads to increased current, making both bulbs brighter.

Correct answer: Both bulbs become brighter.

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