Current-Potential Difference Graphs

Current-potential difference graphs are used to show how the current a component varies with the potential difference it.

	The current through a (at a constant temperature) is to the potential difference across the resistor. This is known as 'ohmic' behaviour as the it obeys ohms law. The gradient of the line is to the resistance. This means the steeper the line the lower the resistance.
The resistance of a increases as the temperature of the filament increases. The increase in temperature is due to the increased current. This can be seen on the graph as the gradient decreases
	The current through a flows in direction only. The diode has a very high resistance in the reverse direction.