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electromotive force |
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electromotive force, abbr. emf, difference in electric potential, or voltage, between the terminals of a source of electricity, e.g., a battery from which no current is being drawn. When current is drawn, the potential difference drops below the emf value. Electromotive force is usually measured in volts volt [for Alessandro Volta ], abbr. V, unit of electric potential and electromotive force . It is defined as the difference of electric potential existing across the ends of a conductor carrying a constant current of 1 ampere when the power dissipated is 1 watt. ..... Click the link for more information. . electromotive forceEnergy per unit electric charge that is imparted by an energy source, such as an electric generator or a battery. As the device does work on the electric charge being transferred within itself, energy is converted from one form to another. The work done on a unit of electric charge or the energy gained by the unit charge is the electromotive force emf (or E) and is characteristic of any energy source capable of driving electric charge around a circuit. A common unit of electromotive force is the volt V, a unit equal to the difference in electric potential between two points in a conductor carrying a current of one ampere and dissipating one watt of power between the two points. The pressure in an electric circuit measured in volts. See volt. |
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| Inductance: The electromotive force induced by changes in the electrical current running through a metal. And in order to realize how important the introduction of the potential has been in electric measurements, one needs only to remember how most minds in this area had only a nebulous understanding of electromotive force, voltage and electroscopic difference, and how finally by Thomson's potentiometers the most delicate investigations became possible. Alternative methods include the use of electromotive force (iontophoresis or ionization), mechanical force (phonophoresis or sonophoresis), or passive permeation. |
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electromotive force
