§10-1 Parallel resonance(谐振) Let us now define resonance. in a two-terminal electrical network containing at least one inductor and one capacitor, resonance is the condition which exists when the input impedance of the network is purely resistive μR(4 r+iol+ joc 83J +f(C、1 R at0=0 0c 0 or 0C OL L resonant frequence LC§10-1 Parallel resonance(谐振） Let us now define resonance. In a two-terminal electrical network containing at least one inductor and one capacitor, resonance is the condition which exists when the input impedance of the network is purely resistive. ) 1 ( 1 L j C R  = +  − j C R j L Y   = + + 1 1 resonant frequence LC r = − − 1  L or C L at C r r r r r       1 0 1 = , − = = R L