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Ratio of Specific Heat capacities (Υ = C P / C V).Electrical Conductivity “Υ”* (reciprocal of Resistivity “rho = ρ”).Time Constant (in capacitive & RLC etc.Time-phase displacement (Phase difference & phase shift in an AC circuits).Thomson coefficient (thermal expansion coefficient and the heat capacity.).The propagation constant of a sinusoidal electromagnetic wave “τ”.More stress! Tau is typically used to denote a specific type of stress called shear stress, as well as propagation constant, Thomson coefficient, the time constant, time-phase displacement, and transmission factor. Σ, κ & γ also used to represent the electrical conductivity. Stefan Boltzmann Constant (for Heat emitted by a black body) σ = 5.67051 × 10 −8 W m −2 K −4.The lower case sigma “” represents almost all kind of stress (not on engineering students) but thermal stress etc.Sum of incoming current = Sum of outgoing current at a point ( Kirchhoff’s current law “KCL”). The Upper case sigma “Σ” represents the “Sum of” any two or more values i.e.Conductivity “σ or Y*” (reciprocal of Resistivity “ρ”).Used as the prefix ‘micro’ for measuring different quantities such as capacitance in Microfarad = 1 μF = 0.000001 F = 10 −6 (One millionth of farad).

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Magnetic constant in free space (μ 0 = 4π x 10 -7 H/m).

Permeance (a measure of the ease with which magnetic flux can be admitted through a material or magnetic circuit.).

Leakage coefficient or leakage factor in Magnetic Circuit “λ”.

*κ, σ & γ also used to represent the electrical conductivity.

Electrical conductivity*, the reciprocal of resistivity, rho (ρ).

Einstein’s Constant of gravitation (lowercase Kappa κ).

Curvature of the Universe (Small Kappa κ).

*In electrical engineering and control systems engineering, the imaginary unit is normally denoted by “ j” instead of “ i”, because “ i” is commonly used to denote electric current.

imaginary Number (The imaginary unit or unit imaginary number “ i”*) is a solution to the quadratic equation x 2 + 1 = 0).

However, I find that that the lowercase is rarely used in engineering or maybe I’ve just never used an equation before with lowercase Iota. If you like matrices you would know that uppercase Iota is used as the identity matrix. Related Post: 5000+ Electrical and Electronics Engineering Formulas and Equations

Transit Angle “the product of the transit time and the angular frequency of the sinusoidal component of the electric current.

Reluctance “the property of a magnetic circuit of opposing the passage of magnetic flux lines” Same like resistance in the electric circuit which opposes the flow of current in the conductor.

Commonly used in trigonometry, power factor and calculation of phase angle between leading/lagging current and voltage.

Intrinsic Impedance of a Medium or Wave impedance.

Intrinsic Standoff Ratio in UJT (Unijunction Transistors).

Related Post: Electrical and Electronic Engineering Symbols

It is easy to memorize (& remember) the value of different quantities and constant values by using Greek alphabets instead of using their name.

and X,Y,Z as variables, So we can’t use the same alphabets and letters for too many different terms in scientific & engineering fields to avoid making confusion.

Latin & English alphabets are widely used like A = Current in ampere, V = Voltage in Volts, P = Power in Watts, R = resistance in Ohms etc.

Now, we follow the same and use Greek symbols in most engineering and scientific contents and technical papers.

The main reason to use Greek characters and symbols is the continuity from the ancient Phoenicians to Greek adoption and used by philosophers ( from BC 750+).The Greek letters as special characters and symbols are used due to the following reasons. Why are Greek Alphabets Used in Scientific, Mathematical and Engineering Disciplines?

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Related Post: 800+ Electrical & Electronic Abbreviations with Full Forms.In this post, we will show the uses of 24 Greek alphabets especially in electrical and electronic engineering. Keep in mind that the lowercase and uppercase (small & capital) letters are used to denote different values in different science and engineering disciplines. There are a total 24 Greek letters which are widely used in engineering, science and mathematics applications which indicates different characteristics and measurement of specific quantities. Greek Letters & Special Character in Electrical/Electronic Engineering Table of Greek Alphabets Used in Electrical / Electronic Engineering.Why are Greek Alphabets Used in Scientific, Mathematical and Engineering Disciplines?.Greek Letters & Special Character in Electrical/Electronic Engineering.