Electricity is a fundamental form of energy occurring naturally (as in lightning) or produced artificially, and results from the motion of electrically charged particles of matter. These charges are either positive, or negative. Positively charged particles, such as protons, repel one another and the negatively charged particles, such as electrons, also repel one another. Negative and positive particles, however, attract each other. This behaviour may be summarized as follows: Like charges repel, and unlike charges attract.

Electricity is a property of matter that results from the presence or movement of electric charge. Together with magnetism, it constitutes the fundamental interaction known as electromagnetism. Electricity is responsible for many well-known physical phenomena such as lightning, electric fields and electric currents, and is put to use in industrial applications such as electronics and electric power.