All Laws Used in Electrical Engineering

Kirchoff's Current law

 The sum of all currents flowing into a node is zero. Or conversely, the sum of all currents leaving a node must be zero or the sum of incoming currents at a node is equal to the sum of outgoing currents. This is kirchoff's first law.

Kirchoff's Voltage law

 The sum of all voltage sources and voltage drops in a circuit is zero. This is kirchoff's second law.

Ohm's law

A law stating that the current in a circuit is directly proportional to the voltage and inversely proportional to the resistance.

I=V/R

Fleming's Left Hand Rule

when an current carrying conductor is placed inside a magnetic field, a force acts on the conductor, in a direction perpendicular to both the directions of the current and the magnetic field. Thumb indicates direction of force, forefinger indicates direction of magnetic field and middle finger indicates the direction of current.

Fleming's Right Hand Rule

 When the conductor moves in a magnetic field the induced current is perpendicular to the motion of the conductor and the magnetic field. Thumb indicates the motion of the conductor, forefinger indicates the direction of magnetic field and the middle finger indicates the direction of current flow.

Ampere's rule

  Ampere's law is used to find the direction of lines of force around a wire carrying current.

Gauss law

The total of the electric flux out of a closed surface is equal to the charge enclosed divided by the permittivity. The electric flux through an area is defined as the electric field multiplied by the area of the surface projected in a plane perpendicular to the field.

Coulomb's first law

Like charges attract each other whereas unlike charges repel each other.

Coulomb's Second law

The force exerted between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

Lenz's Law

Lenz's law states that when an emf is generated by change in magnetic flux the polarity of the induced emf is such that it produces a current which opposes the change which produces it.