Energy power time can be used as long as power is in kw and time in hours the formula becomes. For example if 5 units of electricity are used at a cost of 8p per unit the total cost will be 5 8 40p.
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Units used kwh power kw time h e g.
Cost of electricity formula physics. The kilowatt hour and the cost of electricity paying for electricity. The amount of electrical energy transferred to an appliance depends on its power and on the length of time it is switched on for. You should now be able to work out how much it costs to run an electical appliance as long as you know its power rating the time you use it for and the cost of electrcity.
Http www physicshelp ca free simple easy to follow videos all organized on our website. A 2 5 kw kettle is used for 2 hours a week. Remember that the number of units used can be calculated using this equation.
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