o(t o(t)=voe RC and i(t) e Rc R R LEttE RC U()=eand训=px R =1,→>D(z)=0.368 =3-57,→>U(3-5z)<<1 0.368 R↑,z个,pa=U2/R↓,t个 or:C个,r个,n=C2个,t个t t e R V t V e and i t Let RC     1 0 1 0 ( ) ( ) : − − = = =  t 0 V0 0 0.368V    =     =   or C w C t R p R t C R , 2 1 : , , , , / , 2 2     t RC t RC e R V R t t V e and i t 1 0 1 0 ( ) ( ) ( ) − − = = =   0 0 3 5 , (3 5 ) 1 , ( ) 0.368 t V t V = − → −   = → =      