The various equations such as alpha = Ic/ Ie and Beta = Ic/Ib, Vce = Vcc - IcRc valid for all the three configurations - such as common base, common emitter and common collector configuration? All the problems that I worked out only have the common emitter configuration. So I am confused whether these equations are valid just for that one particular mode of operation. Do the other 2 modes have some other equations and gain parameters?