Ohm's law, unilateral and bilateral circuit, linear and nonlinear component

Ohm's law:

        

          Definition:  Temperature and other physical quantity is remain constant the electric current flowing through the conductor is directly proportional to the potential difference between two ends of the conductor.

  

                I ∝  V

                    I=GV

  

Where,

• V is Voltage in volts (V)
• G is conductance in siemens (℧)
• I is Current in Ampere (A)
• R is Resistance in ohm (Ω)

             G=1/R

          

                 So, V=IR

Limitation of ohm's law:

1. Ohm’s law is not applicable for unilateral electrical elements like diodes and transistors as they allow the current to flow through in one direction only.
2. For non-linear electrical elements with parameters like capacitance, resistance etc the voltage and current won’t be constant with respect to time making it difficult to use Ohm’s law.

Definition of some important terms:

     1)Unilateral Circuits

This is the particular component for which the path of current experience different electrical behaviour along both electrical polarity side.

         eg: diode, transistor etc

     2)Bilateral Circuits

This is the particular component for which the path of current experience same electrical behaviour along both electrical polarity side.

        eg: resistance 

     3)Linear components

the particular component having linear via characteristics and following ohm's law is call linear component. Example resistance 

      4)Nonlinear component

The particular component having non linear v-i characteristics and does not follow ohm's law is call  nonlinear component. Example diode