Difference between Voltage & Current

Usually Voltage is the unit for electric potential, of course in real world we always deal with potential difference and not a single potential. Potential is the capacity to do work in a field. The field may be gravitational where it is called gravitational potential, electric field where it is called electrostatic potential and so on.   

In electrostatics there should always exist a potential difference to move charge hence the work done to move unit charge from one place to another in the electric field is called potential difference. The magnitude of potential difference is measured in "VOLTS".
                  The basic definition of "current" is flow of charge in unit time. For flow of charge, there should exist a potential difference. Electrons always move from lower to higher potential and thus a potential difference is required.As every material has some finite resistance to flow of charge, magnitude of current (flow of number of electrons per second) would be decided by magnitude of potential difference. 

Conclusion:  Voltage is measure of potential difference which is responsible for current i.e flow of charge.            

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