A torch bulb is rated 2V ,500mA . calculate 1)power2) resistance.
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Something seems wrong with this question. First the bulb is exposed to 220 volts and draws 500 ma (0.5 A). Then the statement is made that the rating is 5 volts and 500 ma. The exact same current at two widely different voltages?
From the rating, the resistance is 10 ohms (5.0 / 0.5).
It seems to me that at 220 volts, the current would be 11 amperes (220 / 10) and the bulb would glow very momentarily, at which point the power and rating are moot.
Explanation:
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