How Temperature Dependence of Resistance?
The resistivity of substances varies with temperature. For conductors the resistance increases with increase in temperature. If Ro is the resistance of a conductor at…
Physics
Applications of Superconductors
Applications of superconductors: (i) Superconductors form the basis of energy saving power systems, namely the superconducting generators, which are smaller in size and weight, in…
What is Superconductivity?
Ordinary conductors of electricity become better conductors at lower temperatures. The ability of certain metals, their compounds and alloys to conduct electricity with zero resistance…
Classification of Materials in terms of Resistivity
The resistivity of a material is the characteristic of that particular material. The materials can be broadly classified into conductors and insulators. The metals and…
Describe Ohm’s Law with Equation
George Simon Ohm established the relationship between potential difference and current, which is known as Ohm’s law. The current flowing through a conductor is, I…
What is Current Density?
The current density at a point is defined as the quantity of charge passing per unit time through unit area, taken perpendicular to the direction…
Define and Describe on Drift Velocity
Drift velocity is defined as the velocity with which free electrons get drifted towards the positive terminal when an electric field is applied. If τ…
Define Electric Current
Electric Current: The current is defined as the rate of flow of charges across any cross sectional area of a conductor. If a net charge…
Describe on Van de Graaff Generator
In 1929, Robert J. Van de Graaff designed an electrostatic machine which produces the large electrostatic potential difference of the order of 107 V. The…
What is Lightning Conductor?
Lightning Conductor is a simple device used to protect tall buildings from the lightning. It consists of a long thick copper rod passing through the building…
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