The minimum amount of voltage required for conducting the diode is called knee voltage and it is also known as cut-in voltage. before knee voltage diode behave like a high resistor(means it’s not conduct).
knee voltage is different for different elements for e.g for Si knee voltage is 0.7v, knee voltage is Ge 0.3v. To know more about knee or cut-in…Continue
The bulb resistance has a positive temperature coefficient. The resistance of the bulb increase with an increase in the temperature. The filament resistance changes with increase in the current due to temperature increase. The filament resistance does not remain constant with an increase of current. Therefore, the incandescent/filament lamp does not obey the Ohm's law and filament lamp is a non ohmic.…Continue
The category of non-ohmic conductors includes semiconductors, where conduction is not due to a sea of free electrons but to either a predominance of electrons or of holes, depending on how the material is doped. Put oppositely doped layers adjacent to one another and you get a diode which will only conduct significantly in one direction. Even the galena crystals which used to be used in crystal radios were semiconductors, although over much of the period in…Continue
The example of Ohmic conductor is the resistor The current flowing through the resistor is directly proportional to the applied voltage and voltage across the resistor and current flowing through it have a linear relationship. The resistamce of the conductor depends on the temperature and the resistance increases with an increase in temperature according to temperature coefficient of the resistance. If the current flowing through the resistance increases above…Continue