Answer :

To find the heat produced by iron in the problem, we need to use an expression for produced power, which depends on the resistance of the iron and the current flowing through the iron.

Pmin = VI

360 = 220XI

I = 1.63amp

R = V/I

R = 220/1.63

R = 134.96ohms

In case of maximum heating we get

We know that

Pmax = VI

840 = 220XI

I = 3.81amp

R = V/I

R = 220/3.81

R = 57.74ohms

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