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What is the cost of electricity used in this house in a month of $30 days$ ? If in a house, two tube lights rated $40 W$ each operates for $4 hours$ per day. Two electric fans rated $80 W$ each operates $10 hours / day$ . An electric refrigerator rated $400 W$ operates for $12 hours / day$ and the rate for the electricity bill is $3.20 per KWh$ .

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Detailed Solution

Rs 645.12

is the cost of electricity used in this house in a month of

30 days

. If in a house, two tube lights rated

40 W

each operates for

4 hours

per day. Two electric fans rated

80 W

each operates

10 hours / day

. An electric refrigerator rated

400 W

operates for

12 hours / day

and the rate for the electricity bill is

3.20 per KWh

.
Electric energy consumed by two tube lights per day

({E_{1}}_{}) = 2 \times 40 \times 4 h

{E_{1}}_{} = 320 Wh

…………………………………… (i)
Energy consumed by two electric fans per day

({E_{2}}_{}) = 2 \times 80 \times 10 h

E_{2} = 1600 Wh

……………………………….. (ii)
Energy consumed by electric refrigerator per day

= 400 \times 12 h

E_{2} = 4800 Wh

…………………………………. (iii)
On adding equations (i),(ii) and (iii) we get total energy consumed,
Total energy consumed per day

(E) = E_{1} + E_{2} + E_{3}

Total energy consumed per day

= 320 + 1600 + 4800

E = 6720

E = 6.72 kWh

………………………………. (iv)
Total energy consumed in 30 days

= 6.72 \times 30

= 201.6 kWh

Cost of electricity

= 201.6 \times 3.20

Cost of electricity = 645.12

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