Question

In a school there are 10 electric fans each of 40 W runs for 5 hours a day, 5
electric lamps each of 60 W runs for 3 hour daily. If the cost of each unit
of electricity be Rs. 5, then calculate the monthly cost for electricity

Answer 1

Electrical energy consumed by the bulb per day = P x t = 60 W x 6h = 360 Wh

1 unit = 1 kW h = 1000 W h
1 W h = (1/1000) unit
360 W h = 0.360 unit
Electrical energy consumed by the bulb per day = 0.36 unit

Answer 2

Answer:

RS.435

Explanation:

1 electric fan of 40 w runs for 5 hours=40×5=200 unit

10 electric fans of 40 watt runs for 5 hours=200×10

=2000

for 1 month =2000×30

=60000

convert in kilowatt=60000/1000

=60

1 electric lamp of 60 watt runs for 3 hours

=60×3

=180 unit

five electric lamp of 60 watt runs for 3 hours

=180×5

=900 unit

for 1 month=90×30

=27000

convert into kilowatt

=27000/1000

=27

=60+27×5

=435

Rs 435 answer

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