2.3 System Model and Transfer functions (Transfer function: Laplace transform of the input-output relation of a system) 7 SP1. Electric Circuit u=Ri+l-+u Sⅴstem R C Uo LC a2+h出n L=1 U1(s) LCs+ rcs+12.3 System Model and Transfer Functions (Transfer function: Laplace transform of the input-output relation of a system) SP1. Electric Circuit System R L C Ui Uo i o i o o u u dt du RC dt d u LC + + = 2 2 1 1 2 LCs + RCs + U (s) i U (s) O  = =  + + i dt C u u dt di u R i L o i o 1