Question

An electric refrigerator rated 400 W is used for 8 hours a day . An electric iron box rated 750 W is used for 2 hours a day. Calculate the cost of using these appliances for 30 days if the cost of 1k Wh is rs 3/

Answer 1

Answer:-

(1) - refrigerator

power = 400w

time. = 8 hrs

electrical energy = power* time

E. E. = 400/1000*8

= 3.2kwh

(2) - iron box

power = 750w

time. = 2hrs

electrical energy = 750/1000*2

= 1.5kwh

cost of 1kwh = rupees 3

cost of 1.5kwh = 4.5 rs

cost of month = 4.5*30

= 135 rs

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