Electricity is a form of energy produced by the movement of electrons.

 Electricity is electrical power or an electric current. This form of energy can be sent through wires in a flow of tiny particles. It is used to produce light and heat and to run motors. 

  Parallel and Series Circuit

1. Current ( I). Number of electrons which flow through a cable per  second.    Current is measured in Amp
2. Resistence (R):  The amount of force opposing the current, for example, from a bulb. Resistence is measured in Ohms (Ω)
3. Voltage (V): The "pressure or Energy" forcing the electrons flow around the circuits. The battery suplies the "pressure"

In a circuit the number of electrons cannot disappear and the energy carried by electrons disappears because it is converted into other types of energy.

Ohms Law

V=I*R

    more resources:

Firstenenergycorp  for Kids 

the bbc Schools. Electricity and magnetism