Electricity is simply the presence and flow of charged particles(electrons and protons). The existence of both positive and negative charged particles forms an energy known as Electricity. 

In electricity, charges produce electromagnetic fields which act on other charges. Electricity occurs due to several types of physics:

• Electric charge: a property of some subatomic particles, which determines their electromagnetic interactions. Electrically charged matter is influenced by, and produces, electromagnetic fields.

• Electric current: a movement or flow of electrically charged particles, typically measured in amperes.

• Electric field (see electrostatics): an especially simple type of electromagnetic field produced by an electric charge even when it is not moving (i.e., there is no electric current). The electric field produces a force on other charges in its vicinity. Moving charges additionally produce a magnetic field.

• Electric potential: the capacity of an electric field to do work on an electric charge, typically measured in volts.

• Electromagnets: electrical currents generate magnetic fields, and changing magnetic fields generate electrical currents

In electrical engineering, electricity is used for:

• electric power where electric current is used to energize equipment

• electronics which deals with electrical circuits that involve active electrical components such as vacuum tubes, transistors, diodes and integrated circuits, and associated passive interconnection technologies.