H12-311_V3.0 · Question #186
If the transmit power of the AP is 1mW, after converting to dBm, it will be () dBm.
The correct answer is C. 0. Converting 1 mW to dBm uses the formula dBm = 10 × log₁₀(P / 1 mW), which gives 10 × log₁₀(1) = 10 × 0 = 0 dBm, making C correct. Option B (1 dBm) confuses the unit label with the value - 1 dBm actually equals about 1.26 mW, not 1 mW. Option D (10 dBm) corresponds to 10 mW, and…
Question
If the transmit power of the AP is 1mW, after converting to dBm, it will be () dBm.
Options
- A20
- B1
- C0
- D10
How the community answered
(23 responses)- A13% (3)
- B4% (1)
- C78% (18)
- D4% (1)
Explanation
Converting 1 mW to dBm uses the formula dBm = 10 × log₁₀(P / 1 mW), which gives 10 × log₁₀(1) = 10 × 0 = 0 dBm, making C correct. Option B (1 dBm) confuses the unit label with the value - 1 dBm actually equals about 1.26 mW, not 1 mW. Option D (10 dBm) corresponds to 10 mW, and option A (20 dBm) corresponds to 100 mW - both are common benchmark values worth memorizing. A reliable memory tip: dBm is always referenced to 1 mW as the baseline, so 1 mW is the reference point itself, and any number divided by itself is 1 - log₁₀(1) is always 0, so 1 mW is always 0 dBm, no calculation needed.
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