Advanced Science Primary 5 Systems

Ravi has a circuit with one battery and one bulb. He adds a second identical bulb in parallel to the first. What will happen to the brightness of the first bulb?

A It will become dimmer.
B It will become brighter.
C Its brightness will remain the same.
D It will fuse immediately.
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Worked Solution

Step 1: In a parallel circuit, each branch receives the full voltage of the battery. Step 2: Adding a new branch with a new bulb does not change the voltage across the original branch. Step 3: Therefore, the brightness of the first bulb remains unchanged.

Correct answer: Its brightness will remain the same.

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