Problem 15.122

จาก \(X_{C}=\frac{1}{\omega C}\)

\(X_{C}=\frac{1}{2\pi fC}=\frac{1}{2\pi (50 Hz)(3.5\times 10^{-6} F)}= 0.91 kΩ\)

จาก \(Z = \sqrt{R^{2}+(X_{L}-X_{C})^{2}}\)

\(Z =\sqrt{(1.2)^{2} + (0 - 0.91)^{2}}kΩ\)

\(Z = 1.5 kΩ\)

จาก \(I_{rms}=\frac{\Delta V_{rms}}{Z}\)

\(I_{rms}=\frac{(220 V)}{(1.5\times 10^{3} Ω)}\)

\(I_{rms}= 0.15 A\)

จาก \(\wp _{av}= \wp _{av,R}\)

\(\wp _{av}= I_{rms,R}\Delta V_{rms,R}\)

\(\wp _{av}= I_{rms,R}(I_{rms,R}R)\)

\(\wp _{av}= I_{rms,R}^{2}R\)

\(\wp _{av}= (0.15 A)^{2}(1.2\times 10^{3} Ω)\)

\(\wp _{av}= 27 W \;\blacksquare\)