Fresh EE here that hasn't seemed to cover the main application of either a BJT or mosfet. When should you use one in place of the other? There doesn't seem to be a clear distinction between the two, however I would imagine there are substantional practical differences. Situation in example, ive got a BJT (BD771) handling about 30v at 2A through it. It generates an enormous amount of heat when its fully on. This has me wondering whether a power mosfet is more applicable, since I read they have lower on resistances. If anyone has some literature they could point out to me, that would be appreciated.