Ohm's law - Significance and Its Limitations

Ohm's Law:

• In 1827, the Scientist George Ohm discovered a law that relates the voltage and current in an electric circuit.
• The current flowing through the electric circuit is directly proportional to the potential difference across the circuit provided the temperature remains constant

Significance of Ohm's Law:

• It is used in the design process of any appliances consisting of electric components.
• Ex: 
• Electric Heaters, etc.,
• It is widely used in circuit analysis to find the unknown quantities (ie) Voltage, Current, Resistance, Efficiency, etc.,

Limitations:

• It cannot be applied to non-linear devices like Diode, Regulator, etc.,
• It cannot be applied to non-metallic conductor
• It is applicable only for constant temperature. 
• If the temperature varies, it cannot be applied.

Video for this lecture is available: https://www.youtube.com/watch?v=58VPgkO5yyk