An electric kettle rated 1 kW, 230 V, takes 7.5 minutes to bring 1 kg of water at 15 degree celcius to boiling point. determine heat received by water
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Answer:
The efficiency of the kettle is 79 %.
Explanation:
We are given that:
Power of electric kettle = 1 kW
The voltage of electric kettle = 230 V
Time taken by kettle to raise the boiling point of water = 7.5 minutes
Mass of water = 1 Kg
To Find: The efficiency of electric kettle = ?
Solution:
Heat produced = V x I x t = Pt
Heat produced = 1000 W x 7.5 x 60
Heat absorbed = 1 x 4200 (100 - 15) = 4200 x 85
Efficiency = Heat absorbed / heat produced x 100
= 4.2 x 85 x 10^3 / 4.5 x 10^5 x 100
= 357 / 4.5 = 79 %
Explanation:
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