Insertion loss in terms of power ratio

Q.  How is an insertion loss represented in terms of power ratio?
- Published on 06 Oct 15

a. α = 10 log10 | P1 / P2 | decibel
b. α = 10 log10 | P2 / P1 | decibel
c. α = 20 log10 | P1 / P2 | decibel
d. α = 20 log10 | P2 / P1 | decibel

ANSWER: α = 10 log10 | P1 / P2 | decibel

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