Electric power quality, or simply power quality, involves voltage, frequency, and waveform. In general, it is useful to consider power quality as the compatibility between what comes out of an electric outlet and the load that is plugged into it. The term is used to describe electric power that drives an electric load and the load’s ability to function properly.
Without the proper power, an electrical device (or load) may malfunction, fail prematurely or not operate at all. There are many ways in which electric power can be of poor quality and many more causes of such poor quality power. The electric power industry comprises electrical generator (AC power), electric power transition and ultimately electric power distribution to an electricity meter located at the premises of the end user of the electric power.