Sim-Ex™ Practice Exams for CWNA : Practice Questions

Calculate power in dBm

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Q3. A radio signal has an output power of 10 milliwatts (mW). What is the power level in dBm?

A. 2.5 dBm

B. 25 dBm

C. 10 dBm

D. 250 dBm

Correct Answer: C. 10 dBm


To calculate power in dBm, use the formula: 

dBm = 10 * log(P / 1 mW)

Substitute P = 10 mW into the formula: 

dBm = 10 * log(25 / 1) = 10 * log(10) = 10 * 1 = 10dBm

So, the power level is 10 dBm.

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