So 100W (a tenth of a kW) appliance on for two hours is 3.4p an hour x 2 = 6.8p."
Martin lewis money calculator how to#
He tweeted: " How to calculate energy cost of an appliance: 1.
Martin also took to Twitter to set out the method for calculating the cost of appliances to his 1.8 million followers.
It's cheaper to cook one jacket potato in the microwave." "If you had six jacket potatoes - cause they'd all go in the oven and you don't pay any more - that would still be 34p. An oven can be 1000 to 2000 watts but we'll go generous and say it's 1000 watts - but to cook a jacket potato in an oven it takes say an hour which is 34p. "So you're talking a sixth of 34p - we'll call it 6p - one jacket potato in the microwave is 6p. READ MORE: School dinners under threat due to cost of living crisis How long does a jacket potato take - we say about 10 minutes in a microwave. Martin said: " A typical microwave is 1000 watts - 1000 watts is a kilowatt (kw)- so we know a KW of electricity under the new price cap guarantee is 34p. He said an oven would only be more cost effective if you were cooking more than six potatoes. The Money Saving Expert founder said that it would be cheaper to cook a spud in a microwave than in an oven, due to the length of time it would take and the wattage of each item. Appearing on ITV's Good Morning Britain alongside Susanna Reid (Oct 10), he used the example of cooking a jacket potato to explain the maths people can do. Martin Lewis has outlined how people can easily calculate the cost of running electrical household appliances.
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