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The voltage, also called the potential difference or potential difference, is a physical quantity that measures the difference in energy produced by the unit charge in the electrostatic field due to the difference in potential. The size is equal to the work done by the unit positive charge moving from point A to point B due to the electric field force, and the direction of the voltage is defined as the direction from the high potential to the low potential. Just as water pressure causes water to flow, in a circuit, current is generated by voltage.