Mains Electricity and AC/DC Flashcards
1
Q
What is direct current? (DC)
A
When electrons move in ONE direction.
2
Q
Where is DC supplied from?
A
Cells or batteries.
3
Q
What is alternating current? (AC)
A
When electrons move in more than one direction.
4
Q
Where is AC supplied from?
A
Mains electricity.
5
Q
What is a current?
A
The movement of charged particles.
6
Q
What is the function of a neutral wire?
A
It completes the circuit by carrying the current back.
7
Q
How is the earth wire a safety feature?
A
It provides a low resistance path for electrons if the live wire accidently touches the metal casing.
8
Q
What is the function of a live wire?
A
It carries the current.
9
Q
What is the function of a fuse?
A
The fuse wire melts and breaks the circuit if the current gets too high.
