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» Ohm's Law | Equation Formula and Limitation of Ohm's Law (Electrical Laws)

# Ohm's Law | Equation Formula and Limitation of Ohm's Law (Electrical Laws)

Posted by Circuits Arena on Tuesday, 1 May 2018

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ELECTRICAL,
Ohm's law

Ohm's Law | Equation Formula and Limitation of Ohm's Law (Electrical Laws) is the artlcle explaining Ohm's Law Statement of Ohm's Law Whenever, we apply a potential difference i.e. voltage across a resistor of a closed electri...

### Ohm's Law

#### Statement of Ohm's Law

Whenever, we apply a potential difference i.e. 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), voltage in unit of 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 diode, transistors, etc., which do not have same voltage current relation for both directions of current.

Ohm's law is also not applicable for non – linear elements.

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