(P2) Fuel for power 3.0 / 5 based on 1 rating ? ScienceCrude oil and fuelGCSEOCR Created by: AnjelalaCreated on: 19-05-13 21:11 What do electrical appliances normally display power rating in? Watts (W) and Kilowatts (KW) 1 of 13 What is the equation to work out power? Voltage x Current = Power 2 of 13 What is the equation to work out energy supplied? Power x Time = energy supplied 3 of 13 What is Kilowatt-hour (kWh) ? The unit of electrical energy used in the home 4 of 13 What is the equation to work out the cost of electricity used? energy used x cost per kWh = cost of electricity used 5 of 13 How does the cost of electricity change at night? Electricity is cheaper at night when not as much is needed . 6 of 13 What 4 things do the choice of elctricity depend on? 1) Availability 2) ease of extraction 3) effect on the environment 4) associated risks. 7 of 13 What is the national grid? A series of transformers and power lines that transport electricity from the power station to the consumer. 8 of 13 What 2 things are transformers used to do? ( In the national grid) > step up the voltage to as high as 4000 000 V. >Then step down the voltage to a more suitable level for the consumer. 9 of 13 What 3 things can high Voltage lead to? ( National Grid) 1) reduced energy loss 2) reduced distribution costs 3) cheaper electricity for consumers. 10 of 13 What hapens to a wire when a current passes it? The wire gets hot. 11 of 13 Th greater the current ....( finish the sentence) The greater the current, the hotter the wire. 12 of 13 When a transformer increases the voltage, what happens to the current? The current is reduced so there is less heating effect meaning less energy is lost to the environment. 13 of 13
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