Question

(c) A Radio of 60W runs for 50 Hours. How much electrical energy is consumed in kWh? Why tungsten is
used almost exclusively for the filament of electric lamps.


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Answer 1

We want to calculated the electrical energy in kilowatt-hours, so first we should convert the power of 60 watts into kilowatts by dividing it by 1000. That is :
Power, P =60 watts


kilowatts
= 0.06 kW
And, Time, t = 50 h
Now, putting P = 0.06 kW and t = 50 h in formula:



We get :


So, Energy consumed


= 3 kWh
Thus, the electrical energy consumed is 3 kWh or 3 units.


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