(F. S. – Germany)
NO. PF and Cosφ are two different quantities. Cosφ only measures the phase displacement between the power supply and the power draw. PF (Power Factor) measures phase displacement plus all the other factors that generate reactive power in the system. PF is the most important parameter for evaluating the efficiency of any system that consumes electrical energy. In fact it is the only one that provides a complete measurement of a system’s efficiency in using the electrical power drawn from the AC power supply. (Cosφ only provides a partial measurement).