Gain

In electronics, gain isratiosignal output fromsystemsignal input tosystem. A signalusually measuredunitspower, sincepower gainconsidered more meaningful thanvoltage gain.

The ratiooften expresseddecibels (dB).

For example, if output=500mWinput=5mW then

gain=500/5 = 100 = 2B (bel) or 20dB

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In finance, gainprofit or increasevaluean investment such as stockbond. Gaincalculated by fair market value or proceed from sale ofinvestment minussumpurchase priceall costs associatedit. Ifinvestmentnot converted into cash or another assetgaincalled unrealized gain.

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In psychology, primary gainsecondary gaincommonly seenSomatoform Disorders.