100 W, 220 V bulb is coonected to 110 V source. Calculate the energy consumed (in unit of electricity) by the bulb in 1 hour.
Text Solution
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Resistance of bulb, `R = V^(2)/P = 220^(2)/100 = 484 Omega` When voltage applied, `V'= 110 V` for time `t = 1h`. Eenergy cosumed `= (V')/R t = (110 xx 110)/484 xx 1 = 25 Wh` `=0.025 kWh` Thus unit of energy consumed is 0.025 units of electricity.
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