P3.2.4 - Graphs Of P.d. And Current Flashcards
1
Q
What is a characteristic graph?
A
A graph of current against potential difference
2
Q
What is a linear circuit element?
A
It’s resistance doesn’t change as you change the potential difference
For example wires
3
Q
What is Ohms law?
A
Current is proportional to potential difference if the temperature doesn’t change
4
Q
What is a non-linear circuit element?
A
The resistance is not constant
5
Q
What happens as a wire gets hotter?
A
The ions vibrate more creating more collisions
The current increases as the potential difference increases but at a slower rate
6
Q
What can hot wires be used in?
A
Lamps
7
Q
What is a diode?
A
A component that allows current to flow only one way
8
Q
What is an LED?
A
A light emitting diode
