Question
Q: what is the concept of the Phase Angle? give me conceptiual ans plz.

Consider a periodic process, i.e., one that can be described by a sinusoid, for eg., f(t) = Asin(at+b) where t = time (say), A = amplitude and b = constant.

We usually think of taking the sine of an angle and in this case the argument at+b acts like an angle. The fact that t is a variable, such as time, means that the angle is changing (increasing). The sine function is periodic with a period of 2pi radians, which means that it returns to the same value as ab+t reaches multiples of 2pi.

You can picture this as an angle rotating around a unit circle. The phase of f(t) = Asin(at+b) is just the value of at+b as t increases and corresponds to a particular value of the sine function. Thus a phase angle is just the argument of the sinusoidal function and is usually considered as 0 < phase angle < 2pi.
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#### randy patton

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college mathematics, applied math, advanced calculus, complex analysis, linear and abstract algebra, probability theory, signal processing, undergraduate physics, physical oceanography

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26 years as a professional scientist conducting academic quality research on mostly classified projects involving math/physics modeling and simulation, data analysis and signal processing, instrument development; often ocean related

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J. Physical Oceanography, 1984 "A Numerical Model for Low-Frequency Equatorial Dynamics", with M. Cane

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M.S. MIT Physical Oceanography, B.S. UC Berkeley Applied Math

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