Resistance Flashcards
0
Q
Why is a graph of current against potential difference through a resistor a straight line
A
The current through a resistor is directly proportional to potential difference
1
Q
What does a potential difference graph show
A
How current through a component varies as you change the potential difference
2
Q
Why is there a curve on a graph of resistance through a filament bulb
A
As the temperature of the filament increases the resistance increases
3
Q
What direction does current flow through a diode
A
In one direction forwards
4
Q
Why does a diode have a high resistance in the other direction
A
As it is only meant to go in one direction so when it goes the other way the resistance for current to get through is higher
5
Q
What is the equation for potential difference
A
V= I x r
