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In page Voltage:
"The SI unit of work per unit charge is the joule per coulomb, where 1 volt = 1 joule (of work) per 1 coulomb of charge.[citation needed] The old SI definition for volt used power and current; starting in 1990, the quantum Hall and Josephson effect were used,[1] and in 2019 physical constants were given defined values for the definition of all SI units.
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