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+1 vote
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in Physics by (69.1k points)

A coal based thermal power plant producing electricity operates between the temperatures 27°C and 227°C. The plant works at 80 % of its maximum theoretical efficiency. Complete burning of 1 kg of coal yields 36000 kJ of heat. A house needs 10 units of electricity each day. Coal used for supplying the amount of energy for the house in one year is 

(a)  1141 kg (b) 580 kg (c) 605 kg (d) 765 kg  

1 Answer

+1 vote
by (59.6k points)
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Best answer

Correct option  (a) 1141 kg

Explanation:

Electrical energy requirement of a house : 10 units

= 10 kWhr = 10 x 3.6 x 106 J

Electrical energy requirement of the house per year : 

365 x 3.6 x 107 = 1.314 x 107 kJ

Thermal efficiency of the heat engine :

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