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In electronics, gain measures how much bigger an amplifier's signal output (or the output of some other circuit) is relative to its signal input.

The word "gain" can be ambiguous; "a gain of seven" may imply that either the voltage, current, or the power is increased by a factor of seven.

For example,

When listening to music on the radio, a series of stages converts and amplifies (with a some gain at each stage) an almost imperceptible over-the-air signal, step by step, into a rhythm coming out your speakers as loud as you want it.

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