810-2 Series resonance L Z=R+JOL-j 1 =R+J(oL oC +Vr 十E C The resonant frequency. =0 oroL= oc So that @r LC √LC 矿u(t)=√2 V cos a, t and i(t)=√2cosa,t R L ()==Li(t) cos"@t Vc I V/R R J@,c jo, C RO,C-90 ()=v2 √2J coS(ot-90) sino. Ro C Ro C C、22 L 2 wc(t)=Cuc 2 Ro C snot 2 2 R§10-2 Series resonance C Z R j L j   1 = + − ) 1 ( C R j L  = +  − The resonant frequency: C or L C L r r r r     1 0 1 − = = t R V If t V t and i t  r r ( ) = 2 cos ( ) = 2 cos t R LV w t Li t L r 2 2 2 2 ( ) cos 2 1 ( ) = =  • • •  −  =  =  = 90 R C V j C V / R j C I V r r r C t R C V t R C V t r r r r C       sin 2 cos( 90 ) 2 ( ) = − = t R LV t R C V w t C C r r r C C     2 2 2 2 2 2 2 2 2 sin sin 2 2 1 2 1 ( ) = = = LC LC r r 2 1 1 So that  = →  =