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Chemistry
Understanding the Role of a Voltmeter in Electrode Potential Measurement
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[QUOTE="gleem, post: 6517126, member: 298988"] Although I am not an expert on such measurements, I know one does not use a voltmeter since first a voltmeter draws current from a cell introduces the voltage drop due to internal resistance and second, you cannot measure a contact potential by using a contact type probe. There is a probe called a Kelvin probe that can be used to measure contact potential since it does not need to make physical contact. As far as the overall emf of a cell one uses a potentiometer circuit that does not draw current from the cell. [/QUOTE]
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Understanding the Role of a Voltmeter in Electrode Potential Measurement
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