Discussion
A circuit comprising three identical bulbs and a switch is connected in different arrangements as given below. In which arrangement will the bulbs glow the brightest?
Answer: B
The bulbs glow brightest in Arrangement B, with all bulbs in parallel.
In parallel, each bulb is connected directly across the source, so each gets the full voltage and draws its full current. Each bulb's power, and so its brightness, is the greatest possible.
In series the source voltage is shared among the three bulbs, so each is dim (one third of the voltage, one ninth of the power). The mixed arrangements put at least some bulbs on a reduced share of the voltage, so they cannot match the all-parallel circuit.
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