Decibel || Why -3dB || half power point || Is it -3dB always || 0 dB

Описание к видео Decibel || Why -3dB || half power point || Is it -3dB always || 0 dB

It explains how decibel came into existence.It also describes significance of 3dB and -3dB.The meaning of half power point is discussed.The power ratio and voltage ratio is explained with example.
Meaning of -3dB band width.
Should we take always -3dB
0dB does not mean value is 0.It is reference value.

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