A 200-watt t.v. is used for 20 hours a week. if the rate is 5rs/kWh and it is used for four weeks then the cost of electricity 80 Rs
What is power?
The rate of doing work is known as power. The Si unit of power is the watt.
Power =work/time
The mathematical expression for the electric power is as follows
P = VI
As given in the problem A 200-watt t.v. is used for 20 hours a week, and it is used for four week
The total energy consumed = 200×20 ×4
= 16000 wh
1000 wh = 1 kwh
1 wh = 1/1000 kwh
16000 wh = 16000/1000 kwh
= 16 kwh
The rate of electricity for one unit =5rs/kwh
The total cost of electricity = 16 kwh ×5rs/kwh
= 80 Rs
Thus, A 200-watt t.v. is used for 20 hours a week. if the rate is 5rs/kWh and it is used for four weeks then the cost of electricity 80 Rs
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