49 - Voltage Current and Power in a Balanced 3 - Phase Delta & Star Circuit In todays video, we are going the consider the relationship between the line and phase voltage, current as well as power in a 3 phase system. A three phase system is a system or circuit produced by a generator and consisting of three source having the same amplitude and frequency but are out of phase with each other by 120. Star Configuration VL = root(3)*Vp IL = Ip Delta Configuration VL = Vp IL = root(3)*Ip S = root(3)*VL*IL P = root(3)*VL*IL cos phi Q = root(3)*VL*IL sin phi 00:00 - Star Configuration 09:28 - Delta Configuration 11:50 - Apparent, Active and Reactive Power 13:20 - Example 1 18:35 - Example 2 21:54 - Example 3