u(t)=L 例1:已知i(1)=2eA,L=0.5H,求u(t) (t) 解 +u(t) ()=L() 0.5×2×(-10)e 10t 1 0e 10t例1：已知 t i t e 10 ( ) 2 − = A，L=0.5H, 求 u(t) L + u(t) _ i(t) 解： e (V ) e dt di t u t L t t 1 0 1 0 10 0.5 2 ( 10) ( ) ( ) − − = − =   − = t i u t L d d ( ) =