Volt (V)

Volt definition

Volt is the electrical unit of voltage or potential difference (symbol: V).

One Volt is defined as energy consumption of one joule per electric charge of one coulomb.

1V = 1J/C

One volt is equal to current of 1 amp times resistance of 1 ohm:

1V = 1A ⋅ 1Ω

Alessandro Volta

The Volt unit is named after Alessandro Volta, an Italian physicist who invented an electric battery.

Volt subunits and conversion table

name	symbol	conversion	example
microvolt	μV	1μV = 10-6V	V = 30μV
millivolt	mV	1mV = 10-3V	V = 5mV
volt	V	–	V = 10V
kilovolt	kV	1kV = 103V	V = 2kV
megavolt	MV	1MV = 106V	V = 5MV

Volts to watts conversion

The power in watts (W) is equal to the voltage in volts (V) times the current in amps (A):

watts (W) = volts (V) × amps (A)

Volts to joules conversion

The energy in joules (J) is equal to the voltage in volts (V) times the electric charge in coulombs (C):

joules (J) = volts (V) × coulombs (C)

Volts to amps conversion

The current in amps (A) is equal to the voltage in volts (V) divided by the resistance in ohms (Ω):

amps (A) = volts (V) / ohms(Ω)

The current in amps (A) is equal to the power in watts (W) divided by the voltage in volts (V):

amps (A) = watts (W) / volts (V)

Volts to electron-volts conversion

The energy in electronvolts (eV) is equal to the potential difference or voltage in volts (V) times the electric charge in electron charges (e):

electronvolts (eV) = volts (V) × electron-charge (e)

                             = volts (V) × 1.602176e-19 coulombs (C)