Different Resistors: the current through a resistor is proportional to voltage
Filament Lamp: as the temperature of the filament increases the resistance increases (curve on a graph)
Diode: current will only flow through a diode in one direction
If the graph curves it means the resistance is changing, to work it out use this formula:
Resistance (R)= Potential Difference (V) / Current (I)
Diode = a special device made from semiconductor material such as silicon. It lets current flow freely in one direction but not the other, i.e. there's a very high resistance in the reverse direction
Thermistor (Temperature-dependant Resistor) = in hot conditions the resistance drops, in cool conditions the resistance goes up. Make useful temperature detectors
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