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Voltage is defined as the electrical potential between two points, that is, the potential energy difference between two points due to electrical charge[1] Its unit is the volt.

An important point to note is that only the difference in potential has any practical meaning, not the absolute value. As such, a ground can be defined in a circuit, which has a potential of 0 volts.

See Also

  • Schwarz, Stephen E. and William G. Oldham. Electrical Engineering: An Introduction, 2e. Oxford University Press: 1993.