Answer to Question #161286 in Electrical Engineering for Aliyu Auwal Gunda

Question #161286

What is the average power dissipation in an RLC series circuit with R=10 ohm, L=0.1 H, C=10 MF, when driven at resonance by 100 V-RMS source


1
Expert's answer
2021-02-09T07:06:58-0500

P=Irms×UrmsP=I_{rms}\times U_{rms} ; Z=R2+(LLCLCC)2Z=\sqrt{R^2+(\frac{L}{\sqrt{LC}}-\frac{\sqrt{LC}}{C})^2}

Irms=UrmsZ=I_{rms}=\frac{U_{rms}}{Z}= UrmsR2+(LLCLCC)\frac{U_{rms}}{\sqrt{R^2+(\frac{L}{\sqrt{LC}}-\frac{\sqrt{LC}}{C})}} =100102+(0.10.1×1020.1×102102)2=10=\frac{100}{\sqrt{10^2+(\frac{0.1}{\sqrt{0.1\times10^{-2}}}-\frac{\sqrt{0.1\times10^{-2}}}{10^{-2}})^2}}=10 A

P=10×100=1000P=10\times100=1000 W.


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