Three Phase systems are preferred because of their greater efficiency when it comes to electric motors. Additionally, Three Phase motors last longer than single phase motors, and are available in a much larger range of horsepower sizes. Example of Issue with Phase Angle Difference Calculation with Wrap Around ± 180° ..11 Figure 8. A phase detector or phase comparator is a frequency mixer, analog multiplier or logic circuit that generates a voltage signal which represents the difference in phase between two signal inputs. HVAC Rooftop units, ERV (Energy Recovery Units), Power Exhaust, and other HVAC equipment are full of motors. Path Difference, Phase Difference and Young's Double Slit Experiment Path Difference and Phase Difference. To calculate phase angle between two sine waves we need to measure the time difference between the peak points (or zero crossing) of the waveform. If the frequency of AC is 50 Hz, then the phase difference is equivalent to the time difference of When the particles completer one to and fro motion, the wave advances by a distance equal to its wavelength λ. The measurement of impedance requires the measurement of the magnitude of voltage and current, and the phase difference between them. Phase difference: The time interval by which a wave leads by or lags by another wave is called “Phase difference” or “Phase angle”. When the two quantities have the same frequency, and their maximum and minimum point achieve at the same point, then the quantities are said to have in the same phase. Definition: The phase of an alternating quantity is defined as the divisional part of a cycle through which the quantity moves forward from a selected origin. The phase angle is measured in “Radians / Sec” or “Degrees / Sec” and the phase of a complete cycle is stated as “360 0 ”. The phase difference between current and voltage in an AC circuit is 4 Π radian. Phase & Phase Difference Phase. A phase difference is analogous to two athletes running around a race track at the same speed and direction but starting at different positions on the track. Phase is expressed in angle or radian. Single phase is such because the opposing sine waves are exactly 180° opposite each other, whereas “two phase” systems operate with the sine waves occurring at 90° apart and “three phase operates with the sine waves 120° apart. When a wave passes through a medium, the particles of the medium vibrate. What is Phase: The phase is defined as the position of the waveform at a fraction of time period. 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