Current Electricity

Electric current, flow of electric charges in a metallic conductor, drift velocity, mobility and
their relation with electric current; Ohm’s law, electrical resistance, V-I characteristics (linear
and non-linear), electrical energy and power, electrical resistivity and conductivity, Carbon
resistors, colour code for carbon resistors; series and parallel combinations of resistors;
temperature dependence of resistance.
Internal resistance of a cell, potential difference and emf of a cell, combination of cells in
series and in parallel, Kirchhoff’s laws and simple applications, Wheatstone bridge, metre
Potentiometer – principle and its applications to measure potential difference and for
comparing EMF of two cells; measurement of internal resistance of a cell.



As we have seen, conductivity arises from mobile charge carriers. In metals, these mobile charge carriers are electrons; in an ionized gas, they are...
Drift Velocity

Drift Velocity

The average velocity gained by the free electrons of a conductor in the opposite direction of the externally applied electric field is called Drift...
Electric Current

Electric Current

The flow of electric charges through a conductor constitutes an electric current. Quantitatively, the electric current in a conductor across an area held perpendicular...