>>2148161To raise the temperature of one litre of water from 15°C to boiling at 100°C requires a little bit over 355kilojoules of energy. An “average” kettle in the UK runs at about 2800 W and in the US at about 1500W; if we assume that both kettles are 100% efficient† than a UK kettle supplying 2800joules per second will take 127seconds to boil and a US kettle supplying 1500J/s will take 237seconds, more than a minute and a half longer. This is such a problem that many households in the US still use an old-fashioned stove-top kettle.
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