#### circuit975

##### New Member

Hello everyone

I understood and learned the mathematical expression of the q operating point very well. Now I am trying to learn how to find the operating point on the graph. But in the examples I researched, there is such a solution. (which I drew in red) Id is given values as 3 mA and 5mA. then answers were found by replacing them in the Vgs equation. What is the logic here? According to what values such as 3mA, 5mA are given. How do we know these values?