An electric heater is used on 220 V supply and takes a current of 3.4 A. Calculate (i) its power and (ii) its resistance, when it is in use.
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An electric heater is used on 220 V supply and takes a current of 3.4 A. Calculate (i) its power and (ii) its resistance, when it is in use. (i) Power = Voltage × Current = 220 × 3.4 = 748 Watt (ii) Power = Voltage 2 / Resistance P = V2/R R = V2/P = 2202 / 748 = 64.71 Ω
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