Laws of Electrostatics

Kirchhoff’s Laws:

Kirchhoff’s First Law (current law) :Kirchhoff’s Current Law or KCL, states that the “total current  entering a junction is exactly equal to the current leaving the junction, as no charge is lost within the node.

Kirchhoff’s Second Law (voltage law) : The Algebraic sum of all voltages around any closed path in a circuit is zero.

laws of electrostatics:

A charge at rest q1​ applies a force F on the other charge q2​, also at rest, which are separated by a distance r, then

Coulomb’s law in electrostatic states that the force is directly proportional to the product of both charges and inversely proportional to the square of the distance between them.

                             Ie,    F ∝  q1​q2​​ / r2

Power:

The rate at which work is done in an electric circuit is called electric power.

Power = Work done on electric circuit / Time,   (Work done on electric circuit= VIt)

ie,  P = W/t = VIt /t = VI watts

Energy: 

The total work done in an electric circuit is called electric energy.

Electric energy = Electric power x time

                         = VI.t  kWh