Converting VCVS to CCCS

Hello everyone,

I am having some trouble converting a VCVS (voltage controlled voltage source) circuit to its CCCS (current controlled current source) equivalent circuit.

I am able to solve perfectly the VCVS circuit and I know how to draw the CCCS equivalent. However my problem is with calculating the gain of the CCCS equivalent.

Here is the problem with the solution to this thread. I would just like someone to explain me to my why the equation is Ais = Avo(Ri/Ro).




Thanks again