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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