Current Vs Voltage

If the cell is a building block of the human body then, current and voltage are also a building block in the study of electrical engineering. we consider voltage and current as different quantity but they are interrelated to each other.

Current

It is defined as the rate of flow of electric charges per unit time. the unit of current is ampere(A).

                                       I=q/t

Voltage

It is the energy required to bring a charge(electron) from one point(low potential) to another point(high potential).the unit of current is volts(V).

                                      V=W/q

or from ohms law V=IR where R is the resistance of the conductor. to better understand the concept of current and voltage, let take an example of a river. suppose the water of the river as electrons and kinetic energy/pressure(energy which flows the water in the river) as voltage. if the pressure is low then the flow of water is slow. so it is cleared that for the flow of current, voltage is required.