Terence McCann Posted December 4, 2009 Report Share Posted December 4, 2009 Units of measurement: To measure electrical quantities, certain definitions have been adopted. Charge is a measurement in coulombs © and represented by q in equations. One coulomb is equal to 6.5 X 1018 electrons (or protons). Current, the flow of charge, is measured in amperes (A) and represented by i or I in equations. One ampere represents one coulomb of charge flowing past a point in one second and so amperes can also be expressed as coulombs per second. Electromotive force is measured in volts (V) and represented by e, E, v or V in equations. One volt is defined as the electromotive force between two points required to cause one ampere of current to do one joule (measured as energy) of work in flowing between two points. Voltage can also be expressed as joules per coulomb. And that's the rest of the story. Quote Link to comment Share on other sites More sharing options...
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