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What is are Resistivity Laws?

Encyclopedia

07/25/2024

What is are Resistivity Laws?

Resistivity Definition

Resistivity is defined as a material’s property that opposes the flow of electrical current.

Factors Affecting Resistance

Resistance depends on length, cross-sectional area, material nature, and temperature.

Unit of Resistivity

The unit of resistivity is Ω-m in the MKS system and Ω-cm in the CGS system.

First Law of Resistivity

Resistance increases with the length of the substance.

Second Law of Resistivity

Resistance decreases with a larger cross-sectional area.

Resistivity

That means resistance of a material of unit length having unit cross – sectional area is equal to its resistivity or specific resistance. Resistivity of a material can alternatively be defined as the electrical resistance between opposite faces of a cube of unit volume of that material.

Third Law of Resistivity

The resistance of a substance is directly proportional to the resistivity of the materials by which the substance is made.

Fourth Law of Resistivity

Temperature affects the resistance of a substance.

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Basic knowledge Electrical Laws

Encyclopedia

The Electricity Encyclopedia is dedicated to accelerating the dissemination and application of electricity knowledge and adding impetus to the development and innovation of the electricity industry.

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