open=0 dt:t=0,Uc(07)= (R2+R3)D R R2 (R1+R2+R3) R (R1+R2+R3) C and 0-)=0 t:t=0,Uc(0)=c(0)= (R2+R3)U → a voltage source (R1+R2+R3) U(0+ ic(0)=-2(0) (R2+ R1R,i2(0) i1(0+)+i2(0+) (R1+R2+R3) Doc(oIR, :c(0)=0→0c(0 UC(0=0-Short circuit(0 ) 0 ( ) (0 ) (0 ) 1 2 3 1 2 = + + = = − − − C s and i R R R i i  short circuit If C C C = = − = → − − + (0 ) 0 : (0 ) 0 (0 )    ( ) ( ) : 0 , (0 ) 1 2 3 2 3 R R R R R at t s C + + + = = − −   a voltage source R R R R R at t s C C → + + + = = = + + − ( ) ( ) : 0 , (0 ) (0 ) 1 2 3 2 3    ( ) ( ) (0 ) (0 ) (0 ) 1 2 3 2 3 2 R R R R R i i s C C + + = − + = − = − + + +   R1 R2  s R3 (0 ) 2 + i (0 ) +  C (0 ) + c (0 ) i 1 + i R1  s R3 2 i C i C − +  C 1 i R2