help!! Input output characteristics of BJT I have attached an image of the graph. Does this graph apply for both npn and pnp transistors. I have asked this because for pnp, the collector(c) and base(B) terminals must be reverse-biased at the active region, and B must be at a higher potential than C. Therefore, i think that for the active region Vcb is negative: Vcb= Vc-Vb <0 so Vbc must be positive. As shown in the graph, the transistor is in the active mode for Vcb>0. Why? For npn there is no problem. That's why I'm asking whether this graph applies for both npn and pnp. Please reply. Thanks!