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27 February, 11:54

Q13. An electric bulb draws a current of 0.8A and works on 250V on the average 8 hours a day, if energy costs Rs 3 per kWh. Calculate monthly bill for 30 days.

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  1. 27 February, 12:21
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    Using p=v * i

    p=250 * 0.8=200w = 0.2kw

    power consumed in a day=0.2 * 8=1.6 kwh

    for one month=1.6 * 30 = 48kwh

    monthly bills = 48 * 3 = Rs 144
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