Question
If only 5% of the supplied power to a cable reaches the output terminal, the power loss in the cable, in decibels, is _______. (round off to nearest integer)
Answer :
13 (Range : 13 to 13)
Given :
Power reaches at output terminal (Pout)= 5% of the supplied power (Pin)
Power loss in decibels (dB), in cable = 10 log (Pin/Pout)=10 log Pin-10 log Pout
Power loss in decibels (dB), in cable = 10 log (Pin/0.05 Pin)=10 log 20
Power loss in decibels (dB), in cable = 13.01 dB= 13 dB
Hence, the power loss in the cable, in decibels is 13 dB.
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