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A voltmeter measures the electrical potential difference between two points in an electric circuit.
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What is the relationship between voltage and current? Ohm's law applies to electrical circuits; it states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them. Or simply V = I*R Note that Ohm's law apply only to ohmic materials i.e. Materials which obey ohm's law. Not all materials follow this V = I*R relationship. Ref: http://answers.yahoo.com/question/index?qid=20090420163630AAFGtrK
 





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