Current Electricity

The syllabus of the unit is systematically explained in terms of Synopsis, Conceptual Questions (NCERT Essence in MCQs), Numerical Problems and Smart Revision Tests. All Numerical problems and Questions are elucidated with Video & Text Solutions.
The content empowers a student with confidence in dealing with numerical problems as well as conceptual questions to score at his/her best in entrance examinations (NEET, JIPMER & AIIMS).

• Electric current, flow of electric charges in a metallic conductor, drift velocity and mobility, and their relation with electric current; Ohm's law, electrical resistance, V-I characteristics (liner 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 applications to measure potential difference, and for comparing emf of two cells; measurement of internal resistance of a cell.

1. CONCEPT 1:  Electric current (I), Flow of charges in a metallic conductor, Drift speed (vd), Mobility (μ), Current density , Relation between electric current (I) and drift speed (vd).
2. CONCEPT 2:   Ohm's law, Electrical resistance (R) and conductance (G), Electrical resistivity ( ρ ) and conductivity ( σ ). Temperature dependence of resistance and resistivity, color code of carbon resistors.
3. CONCEPT 3:   Series and parallel combination (Grouping) of resistors
4. CONCEPT 4:   emf and p.d of a cell, Internal resistance of a cell, Grouping of cells
5. CONCEPT 5:   Electrical energy, Electric power.
6. CONCEPT 6:   Kirchhoff's laws, Wheat stone bridge, meter bridge
7. CONCEPT 7:   Potentiometer