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For other uses, see Volt (disambiguation). The volt (symbol: V) is the derived unit for electric potential, electric potential difference (voltage), and electromotive force.
Unit of Resistance â The ohm, which is the resistance that permits a flow of one ampere when the impressed pressure is one volt. V â Symbol for volt. Volt â The practical unit of electric pressure. The pressure which will produce a current of one ampere against a resistance of one ohm.