These parameters are very useful in describing electronic devices such as transistors and others.

We can define the Parameters "H" as:

a) h₁₁ ⇒ Short-circuit input impedance.

b) h₁₂ ⇒ Open circuit reverse voltage gain.

c) h₂₁ ⇒ Short-circuit direct current gain.

d) h₂₂ ⇒ Admittance of open circuit output.

We calculate h₁₁ and h₂₁ connecting a voltage source V₁ or a current source I₁ to Port 1, while short-circuiting Port 2, that is, V₂ = 0. So, knowing V₁, I₁ and I₂ we can determine these parameters.

In the same way, we calculate h₁₂ and h₂₂ connecting a voltage source V₂ or a current source I₂ to Port 2,   while leaving Port 1 as an open circuit,   that is, I₁ = 0. So, we determine the parameters.

When h₁₂ = - h₂₁, we say that the circuit is RECIPROCAL.

See the Figure 33-02 a model of an equivalent circuit of the Hybrid Parameters.