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