An electric bulb is marked 10W, 220V. It is used for 10 hrs daily for 30 days.
Calculate the energy consumed by the bulb in J(joules) and kWh(kilo Watt-hour).
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Power(P)=10W
Voltage(V)=220V
time(t)=10 hours
Energy consumed(E) in a month=Pxt=10x10x30=3000Wh=3kWh
Energy consumed in joules in a month=10x10x60x60x30
J=10800000 J
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