In a simple metal there is one electron loosley bound to each atom , and relatively free to move , not quite free. They keep on bumping into the atoms sometimes recombine . This lack of freedom in motion we call resistance.
When the electrons experience a force causing them to move in one direction -- they move in a 'random walk' or drift with an average speed . This motion we call 'current'.
The AMP is a measure of how many electrons move past a given point when drifting due to a force.
Generally the 'force' is caused or comes about because we have separated electrons from where they wish to be , which is as close as possible to a proton which carries the opposite and attractive charge , located in the atomic nucleus.
In a metal the total number of protons equals the number of electrons -- so the whole is electrically neutral . however it takes 'work ' to separate them ( because there is a force of attraction .
Voltage is defined as the amount of work required to separate charges ( on some unit basis ). It exists because those charges wish to get back together.
If allowed to do so then there is a flow of electrons back from whence they came ( a current) , and experiences some difficulties doing so ( resistance).
SOOOOoo V=I.R tells you that the amount of work is proportional to the rate of electon flow x the difficulty in getting there.
V is one of the hardest electrical units to understand , but in physics it is clinically defined as Joules per coulomb -- the amount of mechanical work done per unit charge in moving charges away from an opposite charge or towards a repelling charge .
We can easilly see current flow , and we can easilly see resistance , but V we cannot see , unless you visualise it as the toil required to do something ( in Human terms that is ).