Standard Science Primary 5 Systems

Alexa has a simple circuit with one battery and one bulb. She adds two more identical bulbs in series to the circuit. What will she observe?

A All three bulbs will be dimmer than the original single bulb.
B All three bulbs will be brighter than the original single bulb.
C All three bulbs will have the same brightness as the original single bulb.
D Only the first bulb will light up.
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Worked Solution

Step 1: Bulbs are added in series. Step 2: In a series circuit, adding more bulbs increases the total electrical resistance. Step 3: The electrical energy from the single battery is now shared among three bulbs. Step 4: Consequently, less current flows, causing all bulbs to become dimmer.

Correct answer: All three bulbs will be dimmer than the original single bulb.

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