define potential difference between poles of a battery ?
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Electrical voltage is also called as electric potential and is defined as the electrical potential difference between two electrical poles of the battery during the flow of electric current. ... The electrical potential difference at this point is called emf – electromotive force of the battery.
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When a free positive charge q is accelerated by an electric field, it is given kinetic energy. The process is analogous to an object being accelerated by a gravitational field. It is as if the charge is going down an electrical hill where its electric potential energy is converted to kinetic energy. The work done on a charge q by the electric field in this process, so that we may develop a definition of electric potential energy
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