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what is potential difference/
The voltage between two points is a short name for the electrical driving force (the concept of driving force is not a force measured in newtons) that could determine an electric current between those points. It is used interchangeably with electric potential difference and electric tension. Specifically, voltage is equal to energy per unit charge. In the case of static electric fields, the voltage between two points is equal to the electrical potential difference between those points. In the more general case with electric and magnetic fields that vary with time, the terms are no longer synonymous.


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