An electric generator converts mechanical energy into electricity, unlike an electric motor, which transforms electrical energy into mechanical energy. The transformed mechanical energy can be from a dam (hydroelectric), thermoelectric, nuclear, or wind energy (wind), to name a few.

In a hydroelectric, the fundamental principle is the movement of turbines that rotate at a certain frequency. The behavior of an electrical generator is periodic, since it is repeated every certain time; for this reason, when the turbine rotates, their amplitudes vary at each instant of time, but with a maximum and a minimum. This amplitude is known as a potential difference, electrical tension, or commonly, voltage.

In a European country, the function that represents the voltage and its supply frequency is:

dsa Analyze the data and indicate how much it is:

V(t) 230sen (314.16t)