Basic Definitions in Physics

Gravitational field strength

The gravitational field strength is the force per unit mass.

Charge

The charge is the property of some elementary particles that gives rise to an interaction between them and consequently to the host of the material phenomena described as electrical.

Coulombs

The coulomb is the quantity of charge which passes any section of a conductor in 1 second when a current of 1 Amp is flowing as given by the equation Q = I x A.

Volt

The volt is the potential difference between 2 points in a circuit when 1 J of electrical energy is converted to other form of energy when 1 C passes from 1 point to the other.

Resistance

The resistance is the ratio of potential difference across an electrical component to current passing through it.

Ohm

The ohm is the resistance of a conductor through which a current of 1 A is flowing when potential difference across it is 1 V.

Electric potential at a point

The electric potential at a point is the workdone in bringing unit charge from infinity to the point.

Capacitance

The capacitance is the charge stored per unit potential difference applied to the capacitor.

Farad

The farad is 1 coulomb per volt.

Magnetic flux density

The magnetic flux density is the force per unit length per unit current on a current carrying conductor at right angle to field lines.

Tesla

A Tesla is one weber of magnetic flux per square meter.