电压单位等于安培的电流通过电阻为欧姆的导线时导线两端的电压是伏特

• a unit of potential equal to the potential difference between two points on a conductor carrying a current of 1 ampere when the power dissipated between the two points is 1 watt; equivalent to the potential difference across a resistance of 1 ohm when 1 ampere of current flows through it