The National Grid (AQA GCSE Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the National Grid?
What is the National Grid?
A system of cables and transformers
What do transformers in the National Grid do?
What do transformers in the National Grid do?
Change the potential difference
What do step-up transformers do to potential difference?
What do step-up transformers do to potential difference?
Increase it
According to , what happens to current when voltage increases at constant power?
According to , what happens to current when voltage increases at constant power?
Current decreases
Why does reducing current lead to less energy loss in cables?
Why does reducing current lead to less energy loss in cables?
Lower current reduces resistance losses
What do step-down transformers do?
What do step-down transformers do?
Decrease P.D. to consumer level
Why are step-down transformers essential?
Why are step-down transformers essential?
For consumer safety
Why is energy always lost in power cables?
Why is energy always lost in power cables?
Due to resistance of the wires
When is less energy lost in power cables?
When is less energy lost in power cables?
When P.D. is high
Why are step-up transformers used to minimise energy loss?
Why are step-up transformers used to minimise energy loss?
They increase P.D., reducing current