Question

A house has 4 tube lights of 40 watts; 5 bulbs of 60 watts; 2 fans of 80 watts used on an average 10 hours a day. The number of units of electrical energy consumed in the month of June are----- [ ]

A) 18.6

B) 1.86

C) 186

D) 1860

Answer 1

$\sf\underline{\underline{Given}}$

A house has 4 tube lights of 40 watts; 5 bulbs of 60 watts; 2 fans of 80 watts used on an average 10 hours a day. The number of units of electrical energy consumed in the month of June are?

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$\sf\underline{\underline{Answer}}$

1kW.h = 1 BOT = 1 unit

Electricity consumption of tube 4 tube light, 5 bulbs, 2 fans

$\sf{(40 \times 4 )+(60 \times 5 )+ (80 \times 2 )}$

$\sf{\ = 160 + 300 + 160}$

$\sf{\ = 620 \: W}$

Electricity consumed in one day

$\sf{\ = 620 \: W \times 10 \: h}$

$\sf{\ = 6200 \: W.h}$

Now,

$\sf{ = \frac{6200}{1000} \: kW.h} = 6.2 \: BOT$

Electricity consumed in the month of June containing 30 days

$\sf{\ = 6.2 \times 30}$

$\sf{\ = 186 \: unit}$

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⚆ Hence, the number of units of electrical energy = 186 unit.

Option (C) 186.