Q : Exchange Rate
Quadratic Mean under RMS : Root Mean Square
Quality Factor IEC Definition, a measure of sharpness of resonance of a system, being 2π times the ratio of the maximum stored energy to the energy dissipated during one cycle
● Note : historically, the letter Q was an arbitrarily chosen symbol to designate the ratio of reactance to resistance of a circuit element. The name "quality factor" was introduced later
International System of Quantities : ISQ IEC Definition, system of quantities based on the seven base quantities: length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity
● Note 1 : the International System of Quantities is published in the International Standard ISO/IEC 80000, Quantities and units.
● Note 2 : the International System of Units (SI) is based on the ISQ.
See also : Symbols