Electricity

What is a Volt? (V)

Definition

The volt (symbol: V) is the SI unit of electric potential difference (voltage). It is defined as the potential difference that drives one ampere of current through a resistance of one ohm. Named after Italian physicist Alessandro Volta, the volt is the fundamental unit for measuring the "pressure" that pushes electric charge through a circuit.

Common Uses

  • › Household mains voltage (120 V in US, 230 V in Europe)
  • › Battery ratings (1.5 V AA, 9 V PP3, 12 V car battery)
  • › Electronic logic levels (3.3 V, 5 V)
  • › Power transmission lines (up to 400 kV)

Converters

Volts to Millivolts → Millivolts to Volts → Volts to Kilovolts → Kilovolts to Volts →

Key Facts

  • Symbol
    V
  • Category
    Electricity
  • 1 V = 1,000 mV
  • 1 kV = 1,000 V
  • 1 V = 1 W/A

Related Terms

About the Volt

The volt (symbol: V) is the SI unit of electric potential difference (voltage). It is defined as the potential difference that drives one ampere of current through a resistance of one ohm. Named after Italian physicist Alessandro Volta, the volt is the fundamental unit for measuring the "pressure" that pushes electric charge through a circuit.

Equivalents and conversions

  • 1 V = 1,000 mV
  • 1 kV = 1,000 V
  • 1 V = 1 W/A

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