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The attenuation in dB in terms of input power (P1) and output power (P2) is?

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The attenuation in dB in terms of input power (P1) and output power (P2) is?

(a) log10 (P1/P2)

(b) 10 log10 (P1/P2)

(c) log10 (P2/P1)

(d) 10 log10 (P2/P1)

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Correct choice is (b) 10 log10 (P1/P2)

To elaborate: The increase or decrease in power due to insertion or substitution of a new element in a network can be conveniently expressed in decibels or in nepers. The attenuation in dB in terms of input power (P1) and output power (P2) is Attenuation in dB = 10 log10 (P1/P2).

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