The equivalent of the current of water is the electrical current, which measures the quantity of electric charge which passes along a section of the circuit each second.  Its unit is the ampere which we can consider to be the rate of one coulomb per second. 

In reality, the moving charges of an ordinary circuit are the electrons which circulate from the negative pole to the positive pole of the  battery. However, traditionally, the official direction is still that of positive charges circulating from the positive pole to the negative one. Click on next to study how the current is measured.