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T5B09
Which decibel value most closely represents a power increase from 5 watts to 10 watts?
Pick an answer to check it.
Answer: B. 3 dB
Decibels for power use dB = 10 x log(P2 / P1). Step: 10 W / 5 W = 2, and 10 x log(2) = 10 x 0.301 = about 3 dB. So doubling the power is a 3 dB increase.
Tip: Double the power = +3 dB.