Circuits 0.0 / 5 ? PhysicsElectricityGCSEAQA Created by: katforrestCreated on: 28-04-17 18:19 Resistors An ohmic conductor is a resistor in which the current is directly proportional to the potential difference at a constant temperature This means that the resistance remains constant as the current changes It is indicated by a linear graph 1 of 4 Filament Lamps As the current 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 2 of 4 Diodes The current through a diode will only flow in one direction The diode has a very high resistance in the reverse direction This is indicated by a horizontal line along the x-axis which shows that no current flows 3 of 4 Thermistors The resistance of a thermistor decreases as the temperature increases This makes them useful in circuits where temperate control or response is required For example, a thermistor could be used in a circuit for a thermostat that turns a heater off at a particular temperature 4 of 4
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