Electric Currents Flashcards
1
Q
What do all materials contain?
A
- Electrons
2
Q
What do insulating materials have?
A
- Electrons that cannot move around
3
Q
How is an electric current formed?
A
- Through if there are electrons in a metal flow
4
Q
Define ‘Current’
A
- Rate of flow of charged particles
5
Q
Define ‘Alternating Current’
A
- Electrons change direction many times each second
6
Q
What does the size of the current depend on?
A
- How much charge is passing a point in a circuit each second
7
Q
How can we work out the charge?
A
- Current x Time
8
Q
How can we change the size of the current in a circuit?
A
- Change the potential difference (voltage) of the cell or power supply
