In an operating electrical circuit the source of potential difference could be

In an operating electrical circuit, the source of potential difference is called the energy source, where current flows from the higher potential to the lower potential. The unit of electrical potentials is known as voltage.

Explanation:

As the charging carriers pass through them, the energy is passed to the electrical components inside a circuit. To measure the potential difference we use a voltmeter.The difference in potential is equal to the sum of current multiplied by the resistance. The potential difference of one volt is equal to one Joule of energy used by one Charging Coulomb as it flows in a circuit between two points.

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