Discussion
Zero dBm corresponds to
Answer: C
The suffix m fixes the reference at one milliwatt, so 0 dBm is 1 mW, 30 dBm is 1 W and -30 dBm is 1 microwatt. One watt is 30 dBm rather than zero. A voltage reference gives dBV or dBmV, which are different units entirely and cannot be compared with dBm without knowing the impedance. One microwatt is -30 dBm. Absolute decibel units always carry their reference in the suffix, and mixing two of them is a reliable source of thirty-decibel errors.
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