电容元件存储的能量为 c(t)=dwc(t)= pd(t)=uid(t) du idt d(t)= Cud(u) dt Cu(t) 2 电容元件存储的电荷量为 4(t)=q(0)+i()d 电容元件电压与电流的关系为 (t)=() u(to)+i(E)ds = = +   t t i d C u t C q t u t 0 ( ) 1 ( ) ( ) ( ) 0 C u (t ) t Cu u t u u C w (t ) w (t ) p t ui t C 2 C 2 1 ]d( ) d( ) d d [ d d( ) d( ) = = = = = =      q t q i ξ ξ t ( ) (0) ( )d 0 = + 电容元件存储的电荷量为 电容元件电压与电流的关系为 电容元件存储的能量为