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An electric lamp is marked 100w and 220v it is used for 5 hours daily calculate its resistance while glowing and energy consumed in kw per day?
power = voltage x current; current = power / voltage = 25W / 220V = 0.11...A
resistance = voltage / current = 220V / 0.11A = 1936 ohms
power = energy / time; energy = power x time = 25W x 1 day = 0.025kW x 1 day = 0.025 kW-days or 0.6 kW h
note: energy is not measured in kw per day, usually kW-hours (kW h).
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