AC vs DC (Alternating Current vs Direct Current Electricity flows in two ways: either in an alternating current (AC) or in a direct current (DC). Electricity or "current" is nothing but the movement of electrons through a conductor, like a wire. The difference between AC and DC lies in the direction in which the electrons flow. In DC, the electrons flow steadily in a single direction, or "forward." Thermostat Wiring Diagrams [Wire Installation] Simple Guide Thermostat Wiring Diagrams - Heat pumps are wired for HVAC control far differently than air conditioning systems so make sure you know the difference and correctly identify the type of HVAC system you have installed. Additionally, before you decide to change your thermostat,.. How to Convert 12 Volt Alternator to 120 Volts | Sciencing Mar 13, 2018An alternator is an electromechanical device that converts mechanical energy into electrical energy. An alternator is so named because it produces alternating electrical current. This energy can be converted from one voltage to another using a transformer. Thus, the 12-volt AC output from an alternator can be transformed into 120 volt-AC current.