Part1 :

One is analogous to gravitational potential energy .

[where we have the all present gravitational field on the Earth's surface.

And I try to pick a 1 KG dumbbell 10 cms vertically high from the ground, so its potential energy increases by mgh, 1* 9.8 * 0.1 = 0.98 ≈ 1 Joule

It also means that I wasted 1 Joule of energy or 0.239 calories.]

Now let us move to a space which is filled with electric field.

Let the field be produced by the theoretical +ve charge(s).

Let us place our test ball which is an aggregate of 1 coulomb of -ve charges near to it as shown in the diagram

(+ve)----(-ve)

Now, I keep on pushing the -ve ball towards the right.

(+ve)----====----====----(-ve)

I stop when I had spent exactly 1 Joule of energy.

Naturally I will see that the charge has moved a distance

====----====----

Let us give names to both ends of the line

A====----====----B

Now, I say that the potential difference between two points A&B is 1 Volt

Is my understanding correct ??

Part2:

Another definition I see is the one without fields.

"The volt is defined as the potential difference across a conductor when a current of one ampere dissipates one watt of power"

Here we see that 'time' comes into the equation the 3rd time in the form of watts, though it gets canceled with amperes. The other two comes from Force, which is composed of acceleration, which in turn is composed of inverse square of time.

Why do we need all this confusion ??

The 2nd definition suits current flow through conductors. Will it suit static electricity ? For eg. though current is not flowing, we could say that the voltage difference between Earth and clouds is 10000V.

Kindly correct me, I am new to this stuff