Write difference between terminal voltage and electro motive force
Rakesh nagora , 8 Years ago
Grade 12
General Physics> Write difference between terminal voltage...
1 Answers
DILIP
Last Activity: 8 Years ago
EMF stands for electromotive force and is a measure of the difference of electrical potential between two points. The strength of an electromotive force is measured in the unit "Volts", named after Alessandro Volta, an Italian physicist credited with inventing the electric battery. (Not named after Voltaire.) We almost always refer to electromotive force as voltage, but EMF and Voltage are just two names for the same thing. Voltage (difference of potential) can be produced by a number of different means, such as chemical means (batteries), electro mechanical means (generator, alternator), static electricity such as a Van De Graaf generator, lightening, or rubbing your shoes on a carpet, photo electric means (solar cells), thermal means such as a thermal couple junction of two dissimilar metals. It is also a measure of the voltage drop caused by passing an electric current through an imperfect conductor, e.g., through a resistor or other impedance. Sometimes the term EMF is used for Electromagnetic Field -- people sometimes refer to "the EMF's" present under a high voltage power line. This is a very loose use of the term and is not at all the same thing as electromotive force or voltage.
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