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An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when the heating is at the minimum. The voltage is 220 V.

What are the current and the resistance in each case?



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Pmax = 840 W
Pmin = 360 W

voltage remains same for both cases.

P = V² / R  = V I

I = 840/220 = 3.82 A  at the maximum heating state
   = 260/220 = 1.18 A at the minimum heating state

R = 220 * 220 / 840 =   57.62  Ohms  at the maximum power or heating
   = 220 * 220 / 360 =  134.44 Ohms at the minimum power or heating

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