Basic Definitions in Physics
Gravitational field strength
The gravitational field strength is the
force per unit mass.
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.
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.
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.
The resistance is the ratio of potential
difference across an electrical component to current passing
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
The capacitance is the charge stored per
unit potential difference applied to the capacitor.
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.
A Tesla is one weber of magnetic flux per