The following is an introduction to voltage:

Voltage, also known as potential difference or potential difference, is a physical quantity to measure the energy difference of unit charge in electrostatic field due to different potentials. The magnitude of voltage from one point to another is equal to the work done by unit positive charge moving from one point to another due to electric field force, and the direction of voltage is defined as the direction from high potential to low potential.

The international unit system of voltage is volts (V for short), and commonly used units are millivolts (mV), microvolts (μV) and kilovolts (kV). This concept is similar to the water pressure caused by the high and low water level. It should be pointed out that the word "voltage" is generally only used for circuits, while "potential difference" and "potential difference" are generally used for all electrical phenomena.

Refer to Baidu Encyclopedia-Voltage for the above information.