All Problems

Electric Oscillations

Problem 4.113

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

Reveal Answer
P=RI2=1/2RIm2=20 mW\langle P\rangle=R\left\langle I^{2}\right\rangle=1 /_{2} R I_{m}^{2}=20 \mathrm{~mW}