1
Q
What does the national grid consist of
A
cables and transformers
2
Q
What is the role of the national grid
A
transfer power from stations —-> consumers
3
Q
what is the function of a step up transformer
A
raise the voltage from the power station into the cables
4
Q
what is the function of a step down transformer
A
lower voltage from cables to a safe level for consumers
5
Q
Why are step up transformers used
A
to prevent energy loss due to heat (if current was high heat loss would be increased)
6
Q
How do you proof that a high current causes power loss
A
in this case use P=I^2R
Resistance is fixed because you can’t shorten the grid
Therefore the current is responsible for loss of power.
Physics - electricity
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