P1.3 Electrical Energy 0.0 / 5 ? PhysicsElectricityEnergyGCSEAQA Created by: annanolanCreated on: 30-01-17 18:14 What are the main ways that electrical appliances waste energy? through heat and sound 1 of 23 What is a powerful appliance? an appliance which transforms energy quickly 2 of 23 What does power mean? energy transformed per second 3 of 23 What is the equation to calculate power, when given energy and time? power = energy transferred / time taken 4 of 23 What are the units of power? watts 5 of 23 How many watts are there in a megawatt? 1 000 000 watts 6 of 23 When a weightlifter lifts a dumbbell, what energy does it gain? gravitational potential energy 7 of 23 True or False, the useful energy out in an appliance is the same as the energy transferred False 8 of 23 True or False, the total power in is the same as the total energy supplied True 9 of 23 How do you calculate efficiency from the useful power out an total power in? efficiency = total power in / useful power out 10 of 23 Which two factors does the amount of energy supplied to an appliance depend on? how long it is used for and the power supplied to it 11 of 23 What is energy transferred measured in? kilowatt-hours (kWh) 12 of 23 How is the total cost of the electricity used in the home calculated? total cost = number of kWh used x cost per kWh 13 of 23 What does cost effective mean? low price for a large number of kWh 14 of 23 What is an example of capital cost? buying equipment 15 of 23 What is an example of running cost? fuel 16 of 23 What is an example of environmental cost? tax charges 17 of 23 How can insulating your home save you money? reduces energy transfer to outside 18 of 23 Give two examples of insulation cavity wall insulation and double glazed windows 19 of 23 What is meant by 'payback time' of insulation? time taken for the money saved through insulation to equal the cost of insulation 20 of 23 Why has the UK government banned the sale of filament bulbs? they use a lot of electrical energy 21 of 23 What is the most efficient type of light bulb? Light Emitting Diodes (LEDs) 22 of 23 What are the advantages of LED bulbs? environmentally friendly, efficient 23 of 23
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