Standard Science Primary 5 Systems

In which of the following circuits will the bulbs be the brightest?

A One battery with two bulbs in series.
B One battery with two bulbs in parallel.
C Two batteries in parallel with one bulb.
D Two batteries in series with one bulb.
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Worked Solution

Step 1: Brightness depends on the amount of electric current. Step 2: Batteries in series increase the total voltage/current. Step 3: Bulbs in series increase resistance, making them dimmer. Step 4: Two batteries in series provide the most power to a single bulb.

Correct answer: Two batteries in series with one bulb.

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