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Home » c) Define kilowatt-hour. How many joules are there in one kilowatt-hour? d) Calculate the cost of operating a heater of 500W for 20 hours at the rate of? Rupees 3.90 per unit.
c) Define kilowatt-hour. How many joules are there in one kilowatt-hour? d) Calculate the cost of operating a heater of 500W for 20 hours at the rate of? Rupees 3.90 per unit.
CBSE | Class 10 | Electricity | Lakhmir Singh | Physics
c) Define kilowatt-hour. How many joules are there in one kilowatt-hour? d) Calculate the cost of operating a heater of 500W for 20 hours at the rate of? Rupees 3.90 per unit.

Answer:

c) One kilowatt hour is the amount of energy utilised by an electrical equipment with a power of one kilowatt for one hour.

d) Given in the question,

P = 500W = 0.5kW

T = 20 hour

Thus, energy consumed will be

E = PT

= 10kWh

We have to find the total cost = ?

Cost per unit = Rupees 3.9

Thus, total cost = Rupees 39

i

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