Physics- Generating and Distributing Electricity page 91 0.0 / 5 ? PhysicsElectricityGCSEEdexcel Created by: emj790Created on: 26-01-17 22:07 What does a power station use? A turbine to turn a huge alternator 1 of 23 How is most of the electricity we use generated? By burning fuels 2 of 23 Give examples of fuels (4) Coal, oil, gas or biomass 3 of 23 How is the burning fuel used? To heat water to turn into steam that turns a turbine that turns a generator 4 of 23 What happens once the electricity is generated? It is transferred to a national grid 5 of 23 What is a generator? A magnet inside of a huge cylinder wound with coils of copper wire 6 of 23 What type of current does the generator produce? Alternating current 7 of 23 What is different about the set up for hydroelectric, tidal and wind power? The turbines are turned directly instead of having to convert to steam first 8 of 23 What type of power generation doesn't use a turbine or generator system? Solar 9 of 23 What is the national grid made up of? A network of wires and transformers 10 of 23 What does is go from and to? From the power stations to consumers (people in houses) 11 of 23 What is the equation for power? Power= energy transferred / time taken or P = E / t 12 of 23 Why does a national grid transmit electricity at a high power? It has to transfer loads of energy each second (short time) 13 of 23 What is the equation for Electrical power? Electrical power= current * potential difference or P= IV 14 of 23 What do they need to do to transmit the huge amounts of power needed? You either need a high potential difference or a high current 15 of 23 How is loads of energy wasted? Through heat energy 16 of 23 How is the energy lost to heat? A high current makes the wires heat up 17 of 23 How can you find the energy wasted? (Equation) Electrical power= current(^2) * resistance or P=I(^2)*R 18 of 23 How can you make the national grid more efficient? High-voltage, low-resistance cables and transformers are used 19 of 23 What happens when you increase the potential difference? You decrease the current 20 of 23 What is the equation at a transformer? Voltage before * Current before = Voltage after * Current after 21 of 23 What do they try to do at transformers? Increase the voltage/ potential difference and decrease the current 22 of 23 What do step-down transformers do? Bring it back to safe, usable levels for the consumers 23 of 23
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