Electricity

Electricity is a electromagnetic field energy.Electricity is a type of energy that can build up in one place or flow from one place to another. When electricity gathers in one place it is known as static electricity (the word static means something that does not move); electricity that moves from one place to another is called current electricity.
In simplest way electricity comes from
Movement of electrons.

Electric current
Just like air or water current flow of electricity us electric current.
Conventional current flows from positive to negative terminal.

Electric circuit
A continuous and closed(ie complete) path of an electrical current is called electric circuit.
     There are several component in a circuit bu the simplest are
     Wire/conductor- conducting medium for current
     PS/battery/cell- voltage source creates potential difference in circuit.
     Switch- open and close circuit
     Resistors- create resistance in circuit
     Transistor- amplify and switch electric current and power.
     Capacitors- it store elctrical energy temporarily.
     

General terms

                               Viscosity
It refers as 'thickness' of a liquid. It is resistance of liquid to flow.



                            Mass


The mass of an object is a fundamental property of the object; a numerical measure of its inertia; a fundamental measure of the amount of matter in the object.

                          Weight


 The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.



                           Density


 It is mass of the matter present in a fix volume.