1Lecture-17 Resonance in LRC Circuit •Forced Harmonic Oscillation If LRC circuit is driven by AC source with VDrive, then The current in circuit maximizes when drive frequency ωDriveequals circuit’s own ωLRC. Total circuit resistance against the current is at minimum. The total circuit resistance, i.e., impedance, can be calculated by “phasors.”Note that under steady state condition, rms values can be used for I, VR,VL, VC : VRrms ≡Square Root of<VR2> , where Thus VR rms≡Irms R VLrms ≡IrmsXL , where XL= ωL VCrms ≡IrmsXC , where XC= (ωC)-1 tVCQdtdQRdtQdLDoωsin22=++2220220221)(sin1)(12RIdttRITdtIRTVoToTR==>=<∫∫ω
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