Physics (P1) - Electrical Energy 0.0 / 5 PhysicsElectrical EnergyGCSEAQA Created by: RomaCreated on: 12-12-13 21:39 Why are electrical appliances useful? They can transfer electrical energy into whatever form. 1 of 7 What is the power of an appliance? The rate at which it transfers energy. 2 of 7 What is the unit of power? Watt (W) - An appliance with a power of 1W transfers 1 joule of electrical energy to other forms of energy every second. 3 of 7 How many Watts are there in a Kilowatt? 1000 4 of 7 What is a kilowatt-hour? The amount of energy that is transferred by a one-kilowatt appliance when used for one hour. 5 of 7 What must you consider to compare the cost effectiveness of different appliances? Cost to buy, cost to install, running costs, maintenance costs, environmental costs, interest charged on a loan to buy the appliance. 6 of 7 What is 'payback time'? The time taken for an appliance or installation to pay itself back in terms of energy savings. 7 of 7

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