Potential difference, because it's based on the difference of voltage at two points.
The more descriptive word which is termed better is: Potential difference. This is because it is based on the difference between the two points.
Potential difference is the difference in the amount of energy that charge carriers have between two points in a circuit. Potential difference is measured in volts and is also called voltage.
Because of its clearer term, a potential difference is more descriptive when talking about voltage. Voltage can be calculated by multiplying the current with resistance.
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