supplying electricty p3
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14 Terms
What is the national grid?
A nationwide network of cables that links power stations to homes
How much energy do power stations generate?
25000V
How much energy do homes and offices use?
230V
What do step-down transformers do?
They decrease the potential difference so its safe for homes to use
What do step-up transformers do?
They are used to increase the potential difference to the transition cables
What colour is the earth wire?
Yellow and green
What colour is the neutral wire?
Blue
What colour is the live wire?
Brown
Why is a plug case plastic
It is a good electrical insulator
Why is the tree core cable copper?
It is a good electrical conductor and bends easily
What is an alternating current?
Current that repeatedly reverses direction
Why os the current provided by a cell called a direct current?
It only flows in one direction
What is the frequency of a house
50Hz
What is the function of a neutral wire in a three core cable?
Completes the circuit so the current can flow