- It is the rate of flow of electric charge flowing though any section of wire.
- Electric current flowing through a conductor is directly proportional to the potential difference across the two ends of the conductor; physical quantities such as temperature, mechanical strain, etc. remaining constant.
Where, R is a constant for a given conductor
Where, r is the specific resistance or electrical resistivity of the material
Conductance and Electrical conductivity:
- Electrical conductivity (s) is defined as the reciprocal of resistivity.
The other form of Ohm's law is
J = current density
E = electric field applied
- Free electrons are in continuous random motion. They undergo change in direction at each collision and the thermal velocities are randomly distributed in all directions.
- Average thermal velocity, is zero … (1)
- is defined as the velocit…
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