Interactive simulation of phasors rotating in the complex plane, projected into voltage vs. time graph. Does phasor sums, products, Euler's representation of a sinusoid. Excellent for learning phasor concepts.

PHASORS was written by Professor Richard Sanford, ECE Dept., Clarkson University, Potsdam, NY 13676. It was copyrighted in 1989, an is subject to "Non-Commercial Use"; that is, you can not sell it or copies of it (for more than the cost of a blank disk). The information below was extracted from the file PHASORS.DOC:

"PHASORS.EXE is an interactive PC program that simulates phasors rotating around the complex (real + imaginary) plane. The real parts of these phasors generate sinusoidal waves, which are shown to the right of the rotating phasors. (The complex plane is rotated + 90 degrees for convenience.)

Users may view ONE phasor; TWO phasors on separate graphs one over the other (representing ac current and voltage of circuit, for example); a SUM of 2 or 3 phasors; EULER'S-Equation representation of a sinusoid; a PRODUCT of two phasors of the same frequency and adjustable phase angle (representing instantaneous power of ac current and voltage); and a DAMPED sinusoid (representing the transient response of an underdamped 2nd-order system).

All have corresponding sinusoids shown dynamically as they are generated by the rotating phasors. Amplitudes, frequencies, initial phase angles, and damping constant (of exponentially-damped sinusoids) are selected independently by the user. The demonstration can be paused and restarted as often as needed to allow careful examination and understanding of the relationships.

PHASORS.EXE is self-explanatory and self-contained, requiring only
an IBM-compatible PC with a graphics card. Just type PHASORS +