Current is defined as an organized movement of electrons through the electrical conductor or space. Each electron carries a certain charge. The movement is caused by a potential difference. It seems complicated but, it’s not. Let’s suppose that we have a waterfall where water falls from a higher level (higher potential) to a lower level (lower potential). The movement of water is caused by a height difference (potential difference) and it continues until the water from the lower level equals the water from the higher level. The same goes for electron movement, it last until the balance is attained. However, unlike water, in this case, the potential difference is not the height difference, but the voltage. Current flows from a higher electrical potential to a lower one. The unit of current is the ampere [A].
The mentioned voltage is responsible for the force of current flow. The voltage is expressed in volts [V]. The combination of voltage and current gives us energy. We can not forget about resistance which disrupts the flow of current. The unit of current is the Ohm [Ω].