The value of transmission parameter A for the two-port network shown is

Concept: 

ABCD Parameter defines for two-port network

\(\left[ {\begin{array}{*{20}{c}} {{{\rm{V}}_{\rm{1}}}}\\ {{{\rm{I}}_{\rm{1}}}} \end{array}} \right] = \left[ {\begin{array}{*{20}{c}} {\rm{A}}&{\rm{B}}\\ {\rm{C}}&{\rm{D}} \end{array}} \right]\left[ {\begin{array}{*{20}{c}} {{{\rm{V}}_{\rm{2}}}}\\ {{{\rm{I}}_{\rm{2}}}} \end{array}} \right]\)

V₁ = A V₂ + B I₂

I₁ = C V₂ + D V₂

V1 = Input voltage 

V2 = Output voltage

I₁ = Input current

I₂ = Output current

A, B, C, D = T-parameter

Calculation:

according to the diagram 

V1 = A V2 + B I2

V₁ = -5I₂ + V₂

Compare both equations

A = 1