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Controlled parameters stay constant throughout the experiment. Variable parameters are the ones you can change.

Hybrid parameters are called so, because the parameters have different units.

In Z- parameters, all the parameters have units of ohms and in Y- parameters, all parameters have Siemens as units. But in hybrid parameters, we have both ohms and Siemens as units.

The other way it is called hybrid is, the independent variables are the input current and output voltage.