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The si unit of potential difference is v.
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The SI unit of Potential Difference is Voltage or volts

A single volt is defined as the difference in electrical potential between two points of a conducting wire when an electric current of one  ampere dissipates one watt of power between those points.

It is also equal to the potential difference between two parallel, infinite planes spaced 1 meter apart that create an electric field of 1 newton per coulomb.

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