An ohmic conductor is a resisitor in which the current is directly proportional to the potential difference at a constant temperaure
This means that the resistance remains constant as the current changes
It is shown through a linear graph
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Filament Lamps
As the lamp through a filament lamp increases, its temperature increases
This causes the resistance to increase as the current increases
It is indicated by a curved graph
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Diodes
The current through a diode will only flow in one direction
The diode has a very high resistance in the reverse direction
Shown by a horizontal line along the x-axis, meaning that no current flows
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Thermistors
The resistance of a thermistor decreases as the temperature increases
This makes them useful in circuits where temperature control or response is required
A thermistor could be used in a circuit for a thermostat that turns a heater off at a particular temperature or an indicator light that turns on when a system is overheating
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Light Dependent Resistors
The resistance of an LDR decreases as light intensity increases
This makes them useful where automatic light control or detection is needed (street lights, phone flash)
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