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Practical Electronics for Inventors, Third Edition by Paul Scherz

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In electronics, the bel is often used to compare electrical power levels; however, what’s more common in electronics and elsewhere is to use decibels, abbreviated dB. A decibel is image of a bel (similar to a millimeter being image of a centimeter). It takes 10 decibels to make 1 bel. So in light of this, we can compare power levels in terms of decibels:
image
(2.89) Decibels in terms of power
Example: Express the gain of an amplifier (output power divided by input ...

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