Standard Science Primary 6 Energy

Sara added one more battery in series to her circuit. What will happen to the brightness of the bulbs?

A The bulbs will become dimmer.
B The brightness will stay the same.
C The bulbs will become brighter.
D The bulbs will immediately fuse.
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Worked Solution

Step 1: Adding batteries in series increases the total voltage. Step 2: More electrical energy flows through the bulbs. Step 3: Brightness increases.

Correct answer: The bulbs will become brighter.

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