PHYSICS P1a 3 - Electrical Energy 0.0 / 5 ? PhysicsElectricityGCSEAQA Created by: Lois EvansCreated on: 11-10-12 21:10 How do you measure the power of a device? in watts (w) or kilowatts (kw) 1 of 10 what is the input energy for any device? The energy supplied to it 2 of 10 What is the output for any device? the usefull energy per second transferred by it 3 of 10 What is 1 watt? the rate of transfer of energy of 1 joule per second 4 of 10 1 kilowatt = ....... 1000 Watts 5 of 10 What is the equation for power = rate of transfer of energy? energy transferred (in joules J) divided by time taken (in seconds S) 6 of 10 what are step up transformers? they are used to step up the voltage to reach the national grid voltage 7 of 10 what are step down transformers? used at the sub stations near our homes to step the voltage back down for our homes 8 of 10 What are the disadvantages of the national grid? 1. visible 2. not aesthetically pleasing 9 of 10 what are the disadvantages of the national grid being underground? 1. cables are more expensive 2. difficult to repair 3.hard to bury where they cross canel, rivers and roads 10 of 10
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