P1 Topic 5: Generation & Transmission of Electricity 0.0 / 5 ? PhysicsElectricityEnergyGCSEEdexcel Created by: bridgetadjeiCreated on: 08-05-16 19:57 What is current? The rate of flow of charge 1 of 31 What do electrons usually carry? Charge 2 of 31 What charge are electrons? Negatively charged 3 of 31 What is voltage (potential difference)? An electrical pressuure giving a measure of the energy transferred 4 of 31 What is alternating current (a.c)? Current which changes direction every seconds 5 of 31 What is direct current (d.c)? Current which flows in one direction 6 of 31 What is electrical power? Energy transferred per second 7 of 31 What are the units for power? Watts (W) 8 of 31 What does an ammeter measure? Current flowing through the circuit 9 of 31 In what kind of circuit will you find an ammeter? Series (all in one loop) 10 of 31 What does a voltmeter measure? Voltage across the component 11 of 31 In what kind of circuit will you find a voltmeter? Parallel 12 of 31 What do you need to generate electricity? A magnet; coil of wire 13 of 31 To create more electrocity, what do you need? More coils; stronger magnet; faster movement; larger surface area of coil 14 of 31 What are the non-renewable energy resources? Coal, natural gas, oil and nclear fuels 15 of 31 What does burning coal and oil produce? Sulfur dioxide (SO2) 16 of 31 What can SO2 cause? Acid rain 17 of 31 What do all fossil fuels release? Carbon dioxide (CO2) 18 of 31 How are non-renewable resources converted into electricity? Fuel is burnt -> water is heated into steam -> steam turns turbine -> turbine starts generator 19 of 31 What are the energy transfers when converting non-renewable energy resources into electricity? Chemical -> Heat -> Kinetic -> Electrical 20 of 31 What are the three most common renewable resources? Hydroelectric, solar panels; wind 21 of 31 What does hydroelectric power usually involve? Flooding a valley by building a big dam 22 of 31 What is causght and allowed out through turbines? Rainwater 23 of 31 How does wind generate electricity? Wind turbines move by the wind and this starts the generator 24 of 31 Where is solar power often found in? Remote places where there are not may other options to generate electricity 25 of 31 What are transformers? Change voltage size 26 of 31 How does electricity reach the consumer? Power stations -> Step up transformer -> step down transformer -> consumer 27 of 31 What does a step up transformer do? Increases voltage for efficient transmittion 28 of 31 Does the step up transformer have more turns or the primary coil or secondary coil? Secondary coil 29 of 31 What does a step down transformer do? Decreases voltage to safe, useable levels 30 of 31 Does a step down transformer have more coils on the primary coil or secondary coil? Primary coil 31 of 31
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