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that the voltage is the electrical potential difference, for two points (A, and B) you measure their voltage and you subtract to find the difference. If you measure the voltage at A isn't that a 'electrcal potential difference' between two points? So is the voltage at A the electrical difference between the voltage at that point and 0 volts. Kind of like the way a pressure gauge measures relative to atmospheric pressure? Except in this case it would be measuring pressure relative to a vacuum?

Is this a valid way to think about it:

V = (Vb - 0) - (Va - 0)

Let me know what you guys think, thank you!