The amount of work required to transport a test charge between two sites in a static electric field depends on the difference in electric potential between the two spots, sometimes referred to as voltage, electric potential difference, electric pressure, or electric tension.
The International System of Unit's derived unit for voltage (potential difference) is called a volt.
Work per unit charge is expressed in SI units as joules per coulomb, or 1 volt = 1 joule (of work) for 1 coulomb (of charge).
The old definition of volt in the SI made use of power and current.
