ISRO Electronics & Communication (ECE) 2015 - Question 25

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Topic: Communications

1 mW in dBm is:

  • A. 0 dBm
  • B. -30 dBm
  • C. 30 dBm
  • D. 1 dBm

Answer: A. 0 dBm

Explanation: P(dBm) = 10 log_10 (P / 10^-3 W) = 10 log_10 (10^-3 / 10^-3) = 0 dBm.

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