Depending on the voltage and the main function, electrical voltage can be:
High: used to transport electricity from generation plants to consumption points; higher than 36 kV.
Medium: used to transport electricity from substations to transformer plants that are close to consumption centers; between 1 and 36 kV.
Low: used for electricity consumption in homes. The number of kV varies by continent: in Europe, it is 230 volts, while in America, between 100 and 127 volts are used.