Among two bulbs, one bulb lights brighter than the other. If connected separately to the same voltage source rather than simultaneously, which bulb has the greater resistance?

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Light does not depend on resistance.

The faint light

The spotlight

The resistances are the same for both.

answer is D.

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Detailed Solution

Assuming that the two bulbs have different brightness levels when connected simultaneously to the same voltage source, the brighter bulb would have the lower resistance.

This is because the brightness of a bulb is directly proportional to the amount of current passing through it, which in turn is inversely proportional to its resistance according to Ohm's law (V = IR, where V is the voltage, I is the current, and R is the resistance).

Therefore, a brighter bulb would have a higher current passing through it, which implies that it would have a lower resistance than the other bulb. When connected separately to the same voltage source, the bulb with the lower resistance would draw more current and therefore shine brighter than the other bulb.

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