In Electrical Engineering
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The Harmonics Visualiser tool is an Excel workbook that presents the vectorial and sinusoidal representation of a system of harmonic components. The magnitude of the vectors can be entered on the left-side of the graphs and the angles are calculated automatically depending on the order of the harmonic component. The vectors are presented as a three phase system whilst the sinusoidal graph is referenced to Phase A or Red Phase. The sinusoidal chart also shows a summation of all the harmonic components into the final resulting wave form. The tool includes an animation function in which the vectors are rotated through a 360 degree cycleRead More →

In Mathematics and Calculations
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SageMath is a free open-source mathematics software system licensed under the GPL. It builds on top of many existing open-source packages: NumPy, SciPy, matplotlib, Sympy, Maxima, GAP, FLINT, R and many more. Access their combined power through a common, Python-based language or directly via interfaces or wrappers.Read More →

In Mathematics and Calculations
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Tiny, powerful, free mathematical program with WYSIWYG editor and complete units of measurements support.It provides numerous computing features and rich user interface translated into about 40 different languages. Application also contains integrated mathematical reference book. https://en.smath.info/ SMath Studio is an invaluable tool for engineers of all disciplines. With is visual  and intuitive “What You See Is What You Get (WYSIWIG)” user interface, the calculations, formulas and variables are visible on the screen. SMath Studio is possibly the best freeware replacement for it’s commercial counter part: Mathcad. Not only can SMath Studio be downloaded as a desktop application, but there are also Android and iOS appsRead More →