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22. How much current will an electric bulb draw from 220 V source if the resistance of the bulb is 1200Ω? If in place of bulb, a heater of resistance 100 Ω is connected to the sources, calculate the current drawn by it.

Answer»

-An ELECTRIC bulb draw from 220 V source if the RESISTANCE of the bulb is 1200ΩTo Find :-CurrentSolution :-We know thatV = IRHereV = VoltageI = CurrentR = Resistance220 = (I)1200220/1200 = I22/120 = I0.18 = IThereforeCurrent is 0.18 ANow, When heater connectedV = I'R'220 = I'(100)220/100 = I' 22/10 = I' 2.2 = ICURRENT is 2.2 A



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