Answer :

(a) Here, P = 4kw, V = 220v

I = ?


We know that


Power = VI = 220 × I


4000 = 220I


I = 4000/220= 18.18A


(b) Here, P = 4kw, V = 220v


R = ?


We know that,


P = I2R


P = (18.18)2×R


R = 4000/(18.18)2


R = 12.10 Ω


(c) Here, P = 4kw, time = 2hr


Energy consumed in two hour = P × t


= 4 × 2


= 8kw-hr


(d) If 1kwh = Rs 4.6


Here, Energy consumed in two hour = 8kwh


So, total cost = 8 x 4.6 = Rs 36.8

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