03. Current Electricity


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Description:

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
bridge.

Potentiometer - principle and its applications to measure potential difference and for
comparing EMF of two cells; measurement of internal resistance of a cell.