- noun unit of energy equal to 1018 Btu
- symbol for Quality factor. A figure of merit for a component, resonant circuit, tuned circuit, periodic device, or energy-storing device. One measure is the ratio of the reactance to the resistance. In the case of a capacitor, for instance, the higher the Q, the longer the time for it to discharge. In the case of an oscillator, for example, the higher the Q, the more stable its output.
- symbol for quantum
- symbol for charge
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