Question

In a premise, 5 bulbs each of 100 W, 2 fans each of 60 W, 2 A.Cs each of 1.5 kW are used for 5 h per day. Find:

(a) total power consumed per day,

(b) total power consumed in 30 days.

(c) total electric energy consumed in 30 days.

(d) the cost of electricity at the rate of Rs 6.25 per unit.

Answer 1

Power consumed by
5 bulbs = $5\times 100$ = 500 W
2 fans = $2\times 60$ = 120 W
2 A.C = $2\times 1.5\times 1000$ = 3000 W

(a) Total power consumed per day = 3620 W

(b) Total power consumed in 30 days, P = $30\times \frac{3620}{1000}$ = 108.6 kw

(c) Electric energy is used for 5 h per day.
Total electrical energy consumed in 30 days =$P\times t$ = $108.6\times 5$ = 543 kWh

(d) Cost of electricity = Total electrical energy consumed (in kWh) x Cost of 1 unit (1 kWh) = $543\times 6.25$ = Rs. 3393.75