alternating current

Alternating current is an electric current in which the direction of flow is reversed at frequent intervals – usually 100 or 120 times per second (50 or 60 cycles per second or 50/60 Hz). When a solar power system (producing direct current) is used in a grid-connected home or used for traditional home appliances, then an inverter is necessary to convert the electricity from direct current (DC) to alternating current (AC). The advantage of alternating current lies in the possibility of changing its voltage (i.e., to 110 V for domestic use or to higher voltages for long-distance transport).