There's not much to go on, so I have to guess.
The phrase "path difference" is one that often pops up in radio or light propagation,
where it's measured in wavelengths (at the operating frequency).
Voltage and potential difference are measured in volts.
Potential . . .Always measured as a potential difference between two points.The most practical way to do that is with a voltemeter connectedin parallel with any circuit between the two points.Electric current . . .The most practical way to measure current is with an ammeter connectedin series in the path of the current.
The unit of measure is the Volt Potential difference is basically electrical "pressure" (an excess of electrons). Volt.....The unit of electric potential. Named after the Italian physicist Alessandro Volta (1745- 1827). The potential difference is the difference in charge at the poles of a current source The volt (symbol: V) is the SI derived unit of electromotive force, commonly called "voltage". It is also the unit for the related but slightly different quantity electric potential difference (also called "electrostatic potential difference"). ... en.wikipedia.org/wiki/Volt
Voltage is measured in volts (V). It represents the potential difference between two points in a circuit, which determines the force that drives electric current to flow.
For constructive interference in a double slit setup, the path length difference between the two waves is equal to a whole number of wavelengths plus a half-wavelength. In this case, for the second constructive fringe (m=2), the path length difference is 1.5 times the wavelength: 1.5 x 500nm = 750nm.
difference between shortest path and alternate path
voltage
'Force' isn't measured in volts. Potential and potential difference are measured in volts.
The phase difference between two waves is directly proportional to the path difference between them. The phase difference is a measure of how much the wave has shifted along its oscillation cycle, while the path difference is a measure of the spatial separation between two points where the waves are evaluated.
The path difference is the difference in the physical distance between the two sources to the observer, i.e., the difference in distance travelled from the source to the observer.
phase diference=path difference x (360 degrees/wavelength)
A tornado's width is measured at bottom, usually by the width of the damage path.
'Force' isn't measured in volts. Potential and potential difference are measured in volts.
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volts
Volts are a measure of electric potential difference.
there is none.