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electromotive force |
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electromotive forceIn physics, the energy supplied by a source of electric power in driving a unit charge around the circuit. The unit is the volt. The term is therefore used to describe the voltage produced by an electric battery or generator in an electrical circuit. A difference in charge between two points in a material can be created when an external energy source such as a battery causes electrons to move so that there is an excess of electrons at one point and a deficiency at a second point. This difference in charge gives rise to electrical potential energy known as emf. It is the emf that causes a current to flow through a circuit. When the source is connected in a circuit some of the energy it supplies will be lost in driving current across its own internal resistance, and so its terminal voltage (the potential difference across its terminals) will be less than its emf. If a source's terminal voltage is V volts, the current it supplies to a circuit I amperes, and its internal resistance r ohms, then its emf E can be expressed as: E = V + Ir or, where R is the total circuit resistance, as: E = I(R + r) How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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futures market regulator on Friday fined hedge fund EMF Financial Products LLC $4 million for making false statements about its market positions relating to U. In order to introduce "store and forward" technology and improve space segment costs, EMF invested in an The text covers key concepts and techniques of EMF modeling, analyzes EMF's most important framework classes and generator patterns, guides users through choosing optimal designs, and introduces powerful framework customizations and programming techniques. |
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