Basic electronics problem with an "amplification factor for a transistor" ((I think it still counts as "introductory physics" -- lemme know if I'm wrong!)) 1. The problem statement, all variables and given/known data http://img600.imageshack.us/img600/7950/back1j.jpg [Broken] http://img690.imageshack.us/img690/999/back2wzt.jpg [Broken] 2. Relevant equations http://img27.imageshack.us/img27/3748/back3za.jpg [Broken] 3. The attempt at a solution So "beta" means "amplification factor for a transistor" - I got it written down but I'm not sure what it means in theory. But, I do see the formulas, so I will try to play with them Well, clearly the formulas are not enough to help me through it. Plugging it to the first formula: 60 = IC/IB Plugging in to the second formula: IE = IB (1+beta) And to the last formula there's nothing to plug, it's just IE = IB + IC Soooooo... Now I got two other tools I know, KCL an KVL, But I can't use any of them since this is NOT a closed circuit! In fact, I'm not sure what these arrows up mean. Can anyone help me please?