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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 electrical energy consumed in $$ 30 $$ days.
(d) the cost of electricity at the rate of $$ Rs.6.25 $$ per unit.


Solution

Power consumed by :
$$ 5 $$ bulbs$$ = 5 \times 100=500 W $$
$$ 2 $$ fans $$ = 2 \times 60=120 W $$
$$ 2 $$ A.C $$=2 \times 1.5 \times 1000=3000 W $$
(b) Total power consumed per day=$$ 3620W $$
(b) Total power consumed in $$ 30 $$ days $$ = \frac{3620}{1000}\times 30=108.6 kw $$
(c) Electric energy is used for $$ 5 $$ h per day.
Total electrical energy consumed in $$ 30 $$ day.
(d) Cost of electricity =$$ P \times t =108.6 \times 5=543 kWh $$
$$ =543 \times 6.25= Rs\ 3393.75 $$

Physics

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