Energy Transfers (AQA GCSE Physics Combined Science): Flashcards
📚Flashcards
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13 cards from this deck
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Practise the cards
13 cards from this deck
What is the National Grid?
What is the National Grid?
Britain's electricity delivery system
National Grid connects (from...to...)
National Grid connects (from...to...)
Power stations to homes, schools, hospitals, factories
Voltage & current in National Grid transmission
Voltage & current in National Grid transmission
Very high voltage and low current
Power loss equation in transmission wires
Power loss equation in transmission wires
(P=power, I=current, R=resistance)
Effect of halving current on power loss
Effect of halving current on power loss
Power loss becomes 4 times smaller (¼)
Why high voltage transmission is used
Why high voltage transmission is used
Lower current for same power = less energy wasted as heat
Step-up transformer function
Step-up transformer function
Increases voltage from power station
Voltage after step-up transformer
Voltage after step-up transformer
132,000 volts (132kV) or higher
Step-down transformer function
Step-down transformer function
Reduces high voltage to safe levels for consumers
Voltage for homes
Voltage for homes
230 volts
Voltage for light industry
Voltage for light industry
11,000 volts (11kV)
3 stages of National Grid system
3 stages of National Grid system
Generation, Transmission, Distribution
Fuels used in power stations
Fuels used in power stations
Fossil fuels or nuclear fuel