Power flow angle is a technical term used to describe the phase difference between the voltage and current in a power system. Synonyms for the word "power flow angle" include voltage angle, phase angle, load angle, and electrical angle. Voltage angle and phase angle refer to the same thing - the difference in phase between voltage and current. Load angle is used specifically in power systems analysis, and electrical angle is a more general term that can refer to any phase difference between electrical quantities. These synonyms are all useful for describing the same concept in different contexts, but they all ultimately refer to the same mathematical value.