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.
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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.
Electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interactions. Electrically charged matter is influenced by, and produces, electromagnetic fields. The interaction between charge and field is the source of the electromagnetic force, which is one of the four fundamental forces.
Electric charge which builds up on an insulator and is thus unable to flow is termed static electricity. Like-charged objects repel and opposite-charged objects attract one another. Static electricity is a class of phenomena involving the imbalanced charge present on an object, typically referring to charge with voltages of sufficient magnitude to produce visible attraction, repulsion, and sparks. Static electricity can be seen at work when hair is combed on a cold, dry day. As the comb is pulled through the hair, strands of hair stand out stiffly. Some kind of force seems to pull the hair upward toward the comb.