Standard Science Primary 6 Energy

What happens to the brightness of a bulb when more batteries are added in series to the circuit?

A It stays the same.
B It decreases.
C It goes out immediately.
D It increases.
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Worked Solution

Step 1: Batteries are energy sources. Step 2: Adding more batteries in series increases the total voltage/energy. Step 3: More energy causes the filament to glow brighter.

Correct answer: It increases.

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