Tuesday 4 October 2011

Electricity:-

          Electricity is a general term encompassing a variety of phenomena resulting from the presence and flow of electric charge. These include many easily recognizable phenomena, such as lightning, static electricity, and the flow of electrical current in an electrical wire. In addition, electricity encompasses less familiar concepts such as the electromagnetic field and electromagnetic induction.

          In general usage, the word "electricity" adequately refers to a number of physical effects. In a scientific context, however, the term is vague, and these related, but distinct, concepts are better identified by more precise terms:
  1. Electric charge: a property of some subatomic particles, which determines their electromagnetic interactions. Electrically charged matter is influenced by, and produces, electromagnetic fields.
  2. Electric current: a movement or flow of electrically charged particles, typically measured in amperes.
  3. Electric field: an influence produced by an electric charge on other charges in its vicinity.
  4. Electric potential: the capacity of an electric field to do work on an electric charge, typically measured in volts.
  5. Electromagnetism: a fundamental interaction between the magnetic field and the presence and motion of an electric charge.
          Electric power provided commercially by the electrical power industry. In a loose but common use of the term, "electricity" may be used to mean "wired for electricity" which means a working connection to an electric power station. Such a connection grants the user of "electricity" access to the electric field present in electrical wiring, and thus to electric power.

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