Best Answer

It depends on how many liters of water. An average kettle holds up to 1.7 liters and takes 3KW. If it takes 3 minutes( 1/20 of an hour) to boil that's 3/20 of a KWh, = 0.15 KWh.

Doing the thermal energy sum, you have say 1.5 liter = 1.5 kg of water raising from say 10 C to 100 C, that's 90 C raise and 1500 grams of water so that makes 135,000 calories. 1 calorie = 4.2 Joules, so we have 567,000 Joules.

1 watt = 1 Joule/sec , 1 KW = 1000 Joules/sec, so 1 KWh = 1000 x 3600 Joules (3600 secs in 1 hour), 1 KWh = 3,600,000 Joules. So 567,000 Joules = 0.1575 KWh.

So the two sums give similar results. If you do a more exact comparison, you could find the efficiency of the kettle from the difference in the two figures, there is bound to be some loss of electrical power, but it should not be much.

Alternative Answers.

For a more accurate answer, use the following formula -

W - Q = [m c (T1 - T2)]water + [m c (T1 - T2)]kettle


W = work done in joules

Q = heat transfer away from the kettle

m = mass of water (and mass of kettle)

c = specific heat capacity of water (and of the material from which kettle is made)

T1 = initial temperature of water/kettle

T2 = final temperature of water/kettle

Then convert your answer from joules to kilowatt hours.

However, the REALLY simple way is to time how long it takes for your kettle to boil, then multiply its nameplate power rating (in kilowatts) by that time (expressed in hours)!

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โˆ™ 2014-03-24 11:34:08
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Q: How many kWh does boiling a kettle use?
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Related questions

What kettle is use for?

A kettle is used for boiling water usually used for making a cup of coffee or tea.

Function of a kettle?

The function of the kettle is to increase the heat of water, by the use of a perfectly placed element, to 100 degrees Celsius(boiling point). This is the temperature where the water will start boiling, destroying all harmful germs. The emergence of the kettle has replaced the boiling of water by fire in most areas and sectors of the world.

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Well, the first thing to do when you use your electric pot is to fill it with water. After doing so, you plug the kettle and turn it on. Usually it will light up (usually red color) when you turn the switch on. It will indicate that the kettle is boiling. It will then turn green when the boiling is done.

How much energy do you waste by using a kettle?

If you want some boiling water to make tea or coffee, you have to use energy to produce it. Why should you consider it wasted? After all, it is not a new fad to want hot water, in the old days people would keep a kettle on the fire, but we don't usually have fires these days, we use electricity or natural gas. What is a waste is to fill the kettle if you only want enough water for one or two drinks. Just put in enough for what you intend to use and that is not a waste. You can work out the energy used by looking up the rating of the kettle in watts, and timing how long it takes to boil, and working it out in KWh.

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About 3 kWh's of heat are created for every kWh of electricity it consumes

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