KV, or kilovolt, is a unit of measurement for electric potential or voltage. It is defined as the potential difference between two points in an electric field that will cause a current of one ampere to flow through a resistance of one ohm. In other words, a kilovolt measures how much electricity can be pushed through a circuit. The prefix "kilo" denotes a factor of 1,000, meaning there are 1,000 volts in a kilovolt. Kilovolts often measure the voltage of high-voltage electrical systems. It is important to note that kilovolts measure electric potential, not power.