potentiometry

World English Dictionary
potentiometer (pəˌtɛnʃɪˈɒmɪtə)
 
n
1.  an instrument for determining a potential difference or electromotive force by measuring the fraction of it that balances a standard electromotive force
2.  a device with three terminals, two of which are connected to a resistance wire and the third to a brush moving along the wire, so that a variable potential can be tapped off: used in electronic circuits, esp as a volume control
 
potenti'ometry
 
n

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