All Problems

Electric Oscillations

Problem 4.113

What mean power should be fed to an oscillating circuit with active resistance R=0.45ΩR=0.45 \Omega to maintain undamped harmonic oscillations with current amplitude Im=30 mAI_{m}=30 \mathrm{~mA} ?

Reveal Answer
⟨P⟩=R⟨I2⟩=1/2RIm2=20 mW\langle P\rangle=R\left\langle I^{2}\right\rangle=1 /_{2} R I_{m}^{2}=20 \mathrm{~mW}
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