Energy Supply & the Home 0.0 / 5 ? PhysicsEnergyGCSEWJEC Created by: reviseLIVCreated on: 20-12-16 19:09 How do electricity companies calculate people's electricity? They count how many units (kWh) of electrical energy 1 of 5 What is the equation for calculating energy? E (kWh) = P (kilowatts) x t (hours) 2 of 5 What are the 2 main energy requirements in the home? Electricity and Heat 3 of 5 What is Payback Time? It is the time it takes to get the money back in energy savings for the money spent on a particular improvement 4 of 5 What is the equation for Payback Time? Payback time (years) = cost / savings per year 5 of 5
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