What is voltage difference?

Answer 1

Voltage at a point is defined as the work done by a unit positive charge carrying it from infinity to that point. while volage diffrance between two points is the work done bye unit positive charge from one point to the other point.

work may be positive or negative depend upon the nature of charge that's why the potential will be negative or positive .

Comment

By definition, voltage means potential difference. For this reason, you cannot have 'a voltage at a point' because potential difference, or voltage, exists between two points. You can, however, have a potential at a point.

Answer 2

There is no such thing as a 'voltage difference'. Voltageis another term for potential difference, so 'voltage difference' would mean 'potential difference difference', which doesn't make sense!

So, there is 'potential', and there is 'potential difference' (i.e. 'voltage'), but there is no 'voltage difference'! Both potential and potential difference are measured in volts.

Incidentally, strictly speaking, 'voltage' is rather like 'amperage' -both are loose, but widely-used, expressions for 'potential difference' and 'current'.

Answer 3

'Voltage' is simply another term for 'potential difference'. It is NOT the same as 'potential', however.