Potential Difference Flashcards
1
Q
what component is used to measure p.d?
A
voltmeter
2
Q
what is a definition of potential difference?
A
- difference in amount of energy
- that charge carriers have between two points in a circuit
3
Q
a p.d of one volt is equal to…
A
- one Joule being used by one Coulomb
- when it flows between two points in a circuit
4
Q
what component is used to measure current?
A
ammeter
5
Q
how is charge flow affected?
A
- resistance increases, current decreases
- potential difference increases, current increases
6
Q
what is the meaning of resistance?
A
a measure of how difficult it is for current to flow through a component
7
Q
the longer the wire…
A
the higher the resistance
8
Q
how can you plot a current-voltage graph?
A
- varying p.d across circuit component and measuring the current
- constant slope tells us resistance is constant
9
Q
A
