Question

What is the working resistance of a bulb that takes a current of 0.25 A when it is connected to 220V mains supply?

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Answer 1

data given we have a current of 0.25A and potential difference of 220V then from ohm's law I=V/R 0.25A=220V/R cross multiplication you get 0.25A×R=220V divide by 0.25A on both side you get 880 ohms