Question

An institute uses 20 tubelights of 60 W each, 15 fans of 40 Weach and 2 table lamps of 100 W each for
5 hours a day. How many units of electricity are used in the month on April ?
(A) 250 kWh
(B) 300 kWh
(C) 200 kWh
(D) 1000 kWh​

Answer 1

Answer:

1000 kWh

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Answer 2

B) 300kWh  units of electricity are used in the month on April.

Given:

An institute uses 20 tubelights of 60 W each, 15 fans of 40 W each and 2 table lamps of 100 W each for 5 hours a day.

To find:

How many units of electricity are used in the month on April ?

Solutions:

To find the electricity used in month of April first we will find electricity usage for one day.

For that, first we will find electricity used by tubelights, fans and tables per day individually.

1kWh = 1000 Wh

First, we will find electricity consumed by tubelights in a day

Electricity consumed by 1 tubelight = 60W

Electricity consumed by 20 tubelights = Electricity consumed by 1 tubelight * 20 = 60*20= 1200 W

Electricity consumed by 20 tubleights for 5hrs a day = Electricity consumed by 20 tubelights*5 = 1200 * 5 = 6000Wh = 6kWh

Now, we will find electricty consumed by fans in a day

Electricity consumed by 1 fan = 40W

Electricity consumed by 15 fans = Electricity consumed by 1 fan * 15 = 40* 15 = 600 W

Electricity consumed by 15 fans for 5hrs a day = Electricity consumed by 15 fans*5 = 600*5 = 3000Wh = 3kWh

No, for table lamp

Electricity consumed by 1 table lamp = 100W

Electricity consumed by 2 table lamps = Electricity consumed by 1 table lamp * 2 = 100*2= 200 W

Electricity consumed by 2 table lamps for 5hrs a day = Electricity consumed by 2 table lamps * 5 = 200*5 = 1000Wh = 1 kWh

Total electricity used in one day = Total electricity used by tubelights, fans and table fans in one day

= 6 + 3 + 1 = 10kWh

Total electricity in April = days oin april * electricity used for one day

= 30 * 10

= 300kWh

Hence, answer is B)300kWh.

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