What is the difference in dBm when an AP power increases from 25 mW to 100mW?

A. 75dBm
B. 150dBm
C. 6dBm
D. 125dBm

What is the difference in dBm when an AP power increases from 25 mW to 100mW?

A. 75dBm
B. 150dBm
C. 6dBm
D. 125dBm

Correct Answer: C

Power (in dB) = 10 * log10 (Signal/Reference)

10*log(100) - 10*log(25) = 20dbm - 14dbm = 6dbm

OR the easiest calculation is using the laws of 3s covered in the book. A value of 3dB means that the power value of interest is double the reference value.
25x2=50 that's 3db gain 50x2=100, that's another 3db. 3+3=6db