Attenuation and power loss

I’m revising attenuation and power loss logarithmic equations.

The exam formula I’m given is attenuation = 10 log (I1/I2)

I’m trying to confirm what each I stands for.

Some of the examples I’m looking at seen to give input/output power, some seem to reverse it. Which is right? What do they stand for?

http://ift.tt/1jATCay

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