Question

an electronic iron consumed energy at the rate of 880 w when heating is at the maximum rate and 440 w when heating at the minimum rate the applied voptage is 220 v calculate the current and resistance in each case

Answer 1

Hey.

Power = V × I

For maximum case :

P = 880 W = 220× Im

so, Imax = 880/220 = 4 A

Also R = V/I

so, Rmax = 220/4 = 55 ohm

Similarly

For Minimum case:

P = 440 W = 220×Imin

so, Imin = 440/220 = 2 A

and R min = V/I = 220/2 = 110 ohms

Thanks.