Electricity is generally classified into two broad categories: Electrodynamic and Electrostatic. 1. Electrostatic Electricity: This is also known as static electricity. It is the build-up of an electrical charge on the surface of an object. The charge build-up is caused by the transfer of electrons from one object to another. This is the type of electricity that causes you to get a shock when you touch a metal doorknob after walking across a carpeted floor. 2. Electrodynamic Electricity: This is also known as current electricity. It is the flow of electric charge across an electric field, particularly across a conductor. This flow of electric charge creates an electric current. This is the type of electricity that powers our homes and electronic devices. These two classes of electricity are fundamental to understanding the principles of electricity and electromagnetism