#### david753

##### Full Member level 1

In a system analysis, we can transfer a system to a Transfer function, H(W)

, the equation may be like that, H(s)=s/(s^2+3s+2)

Then, we can plot a frequency response (BODE PLOTS)by H(s) function.

and, "s" equals "w".

But, in Laplace Transform function, "s" equals "sigma+j*w".

Obviously, it is different.

How to explain it?

2.

laplace u(t) is equal U(S)/S.

What does it,U(S)/S mean in terms of physic ot math viewpoint?