Standard Science Primary 5 Systems

Jun Jie has a circuit with one battery and one bulb. He adds another identical bulb in series. What will happen to the brightness of the first bulb?

A Its brightness will remain the same.
B It will become dimmer.
C It will flicker and turn off.
D It will become brighter.
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Worked Solution

Step 1: Adding a bulb in series increases the total resistance in the circuit. Step 2: The same amount of electrical energy from the single battery must now be shared between two bulbs. Step 3: Therefore, the electric current flowing through each bulb decreases, making them dimmer.

Correct answer: It will become dimmer.

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