# Simple Y-parameter (admittance-parameter) matrix problem?

1. Jun 24, 2013

### asdf12312

1. The problem statement, all variables and given/known data

2. Relevant equations
general form of Y-parameter is
[I1]=[Y11 Y12][V1]
[I2]=[Y21 Y22][V2]

3. The attempt at a solution
i think i was confused what exactly this problem asked for. the general equation for I1 for instance you would add the variables, so I1=Y11(V1)+Y12(V2). to calculate Y11 also, you would add a 1V source on the left side, and short-circuit the right side. so i'm pretty sure it would be Y11=($\frac{1}{Ya}$+$\frac{1}{Yb}$)s. since the only signs i saw in these equations were '+' i put the 1st choice (A) as my answer.

2. Jun 24, 2013

### rude man

The idea is that, for two networks, the input currents i1A and i11B are added and so are the output currents i2A and i2B . This implies that the individual admittance parameters yij for A and B are also added.