Energy Transfers (AQA GCSE Physics): Flashcards
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Practise the cards
13 cards from this deck
What is the National Grid?
What is the National Grid?
System of cables & transformers linking power stations to consumers
What is the purpose of the National Grid?
What is the purpose of the National Grid?
Transfers electrical power from power stations to consumers
Function of transformers
Function of transformers
Change the potential difference
Step-up transformer effect on P.D.
Step-up transformer effect on P.D.
Increases the potential difference
Where are step-up transformers used?
Where are step-up transformers used?
Between power station and National Grid
Power equation
Power equation
(Power = Voltage × Current)
What happens to current when P.D. increases (at constant power)?
What happens to current when P.D. increases (at constant power)?
Current reduces
Benefit of step-up transformers
Benefit of step-up transformers
Less energy loss due to reduced current
Step-down transformer effect on P.D.
Step-down transformer effect on P.D.
Decreases the potential difference
Where are step-down transformers used?
Where are step-down transformers used?
Between National Grid and consumers
Why are step-down transformers needed?
Why are step-down transformers needed?
Consumer safety
Cause of energy loss in power cables
Cause of energy loss in power cables
Resistance of the wires
How to minimise energy loss in cables
How to minimise energy loss in cables
Use high P.D. (via step-up transformers)