NON-OHMIC CONDUCTORS

==Non-Ohmic Devices== If a device behaves in a way that is NOT described by Ohm’s law, (i.e. the resistance is not constant, but changes in a way that depends on the voltage across it.) The device is said to be non-Ohmic. In this case V versus I graph is not a straight line, but has some curvy shape. Such devices do not have a constant value of resistance and the resistance is called dynamic resistance because it is constantly changing. Examples of such devices are tungsten filament (bulb), diode, thermistor etc... Current-Voltage characteristics for different components are shown below: [image:http://i.imgur.com/ClIOU8U.jpg]