dB commonly known as decibel, deci can also indicate to one tenth.It is a unit of Power Gain, in the units of 10lg, it shows a relative value.10 lg A/B is a unit for counting, it can be used in calculations, for solve how many dB has power A gain or loss than power B. For voltage or electron current, dB = 20*lg(A/B). In other words, a dB is to facilitate an enormous number (positive or n……