A kettle consumes 198 kJ to boil water. If 168 kJ was used to boil the
water, what is the efficiency of the kettle?

Efficiency is used to measuring how much work or energy we can conserve in a process. In other words, it is like comparing the output of the energy to the input of the energy in any given system.

It is also define as the ratio of Energy Input to the Energy Output. To express it in percent multiply it by 100.

Here, Efficiency = Energy output / Energy input

[tex]η =\frac{W_{out} }{W_{in} } * 100[/tex]

[tex]η = \frac{198kJ}{168kJ} * 100[/tex]

= 117.9%

So , the efficiency is 117.9%

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A kettle consumes 198 kJ to boil water. If 168 kJ was used to boil the water, what is the efficiency of the kettle?

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What is efficiency?

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A kettle consumes 198 kJ to boil water. If 168 kJ was used to boil the
water, what is the efficiency of the kettle?