Posted by Circuits Arena on Tuesday, 1 May 2018
Limitation of Ohm's Law, Equation Formula and Statement of Ohm's Law is the artlcle explaining Limitation of Ohm's Law Statement of Ohm's Law Whenever we apply a potential difference i.e. the voltage across a resistor of...
Limitation of Ohm's Law
Statement of Ohm's Law
Whenever we apply a potential difference i.e. the voltage across a resistor of a closed electric circuit, current starts flowing through it. The statement of Ohm's law says that the current (I) is directly proportional to the applied voltage (V), provided temperature and all other factors remain constant. Mathematically,
Where R is constant of proportionality.
This equation presents the statement of Ohm's law. Here, we measure current in Ampere (or amps), the voltage in the unit of the volt.
The constant of proportionality R is the property of the conductor, we know it as resistance and measure it in ohm (Ω). Theoretically, the resistance has no dependence on the applied voltage, or on the flow of current. The value of R changes only if the conditions (like temperature, diameter and length etc.) of the resistor are changed by any means.
Limitation of Ohm's Law
The limitations of Ohm's law are explained as follows:
This law cannot be applied to unilateral networks.
A unilateral network has unilateral elements like the diode, transistors, etc., which do not have the same voltage-current relation for both directions of current.
Ohm's law is also not applicable to non – linear elements.
