Discussion
An antenna of radiation resistance 73 ohms carries an rms current of 1 A. The power radiated is
Answer: B
Correct answer: 73 W
\[ P = I^2 R_{rad} = 1^2 \times 73 = 73\ \mathrm{W}. \] Radiation resistance is defined so that this works: it is the fictitious resistance that would dissipate the power the antenna actually radiates. The value 73 ohms is that of a half-wave dipole, and the current must be rms for the answer to be an average power.
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