Translations:Electricity types/2/en

There are two types of electricity – alternating Current (AC) and direct Current (DC). These two terms describe the way in which the current flows in a circuit. In a DC circuit, the current only flows in one direction, meaning that this type of circuit has a positive (+) and negative (-) that do not change. This relationship of positive to negative charge is referred to as polarity. In an alternating current circuit, current flow changes direction regularly, switching the polarity (positive (+) and negative (-)) each time. This switching back-and-forth of polarity in an alternating current circuit is referred to as frequency and is measured in Hertz (Hz). Polarity in a typical AC circuit switches between 50-60 times per second meaning that the circuit has a frequency of 50-60 Hz.