P5 Flashcards
how does direct current flow
In one direction only
How does alternating current flow?
It repeatedly changes direction
Which two wires does a mains circuit have?
A live wire and a neutral wire
Where is the electricity that flows to your house supplied from
From powerstations through the national grid
What is the national grid?
A network of cables and transformers
What are step up transformers used for?
To transfer electricity to the national grid.
What do step up transformers do?
They make the size of the alternating potential difference much bigger
What are step down transformers used for?
To supply electricity from the national grid to consumers
What is the peak potential difference of an ac supply?
The maximum voltage measured from zero volts
Where is the earth wire connected to in your home?
The ground
What are the cases on plugs made from?
Stiff plastic
Why is the case made from plastic?
Because plastic is a good insulator
What colour is the live wire?
Brown
What colour is the neutral wire?
Blue
What colour is the live wire?
Green and yellow stripes
