Chapter-3|Current Electricity| NCERT 12th Physics: Ohm’s Law: It is stated that the current I flowing through a conductor is always directly proportional to the potential difference V across the ends of the conductor, provided that the physical conditions (temperature, mechanical strain, etc) are kept constant. Note: The value of a resistance of a conductor depend […]
Chapter-3|Current Electricity| NCERT 12th Physics: Electric Current in Conductors: The electrical conductivity of a solid substance depends upon the number of free electron in it. In metals, this number is quite large (nearly 10²⁹/m³). Hence metal are good conductors of electricity. In metals, the electric conduction occurs by the movement of negative charge Carriers (electrons)
Chapter-3|Current Electricity| NCERT 12th Physics: Current Density: The current density at any point inside a conductor is defined as the amount of charge flowing per second through a unit area held normal to the direction of the flow of charge at that point. It is a vector quantity having the same direction as that of
Chapter-3|Current Electricity| NCERT 12th Physics: Electric Current: If two bodies charged to different potentials are connected together by means of conducting wire, charges begin to flow from one body to another. The charges continue to flow till the potential of the two bodies become equal. The flow of electric charges through a conductor constitutes an
