Energy Transfers (AQA GCSE Physics): 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?
Network of wires carrying electricity from power stations
What does the National Grid NOT include?
What does the National Grid NOT include?
Power stations and end users - only the transmission system
Why does National Grid use high voltage and low current?
Why does National Grid use high voltage and low current?
For efficient transmission with minimal energy losses
Equation for power wasted as heat in wires
Equation for power wasted as heat in wires
Power loss is proportional to...
Power loss is proportional to...
Square of current ()
Energy loss reduction when current is halved
Energy loss reduction when current is halved
Reduced by a factor of 4
Power loss when current doubles
Power loss when current doubles
Increases by a factor of 4
Where step-up transformers are located
Where step-up transformers are located
Near power stations
Voltage that step-up transformers increase to
Voltage that step-up transformers increase to
132kV or higher
Where step-down transformers are located
Where step-down transformers are located
Near homes and industry
Voltage supplied to homes
Voltage supplied to homes
230V
Voltage supplied to light industry
Voltage supplied to light industry
11kV
Transmission voltage across the country
Transmission voltage across the country
132kV or higher