Advanced Science Primary 6 Energy

Adding more bulbs in series to a circuit will cause the existing bulbs to __________.

A become brighter
B become dimmer
C remain the same brightness
D burn out immediately
Show Worked Solution

Worked Solution

Step 1: In a series circuit, the voltage of the battery is shared among all bulbs. Step 2: More bulbs mean less voltage for each. Step 3: Therefore, the brightness of each bulb decreases.

Correct answer: become dimmer

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