How to determine output and onput characteristics of transistor in given mode? I am confused about what versus what graph displays output characteristics of given particular transistor (same confusion about input characteristics). For example in common emitter npn transistor I\(_{}C\) Vs V\(_{}CE\) graph shows output characteristics, but why I\(_{}C\) Vs V\(_{}CE\)? Please explain how to determine that for both input and output characteristics?