1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution This is a solved example in my Physics textbook . I don't understand how this problem can be done without specifying the battery VBB in the Base Emitter loop . The author assumes that the 20 V battery is connected between both Base-Emitter as well as Collector Emitter ? Instead it should be VBE = VBB - IBRB ? VBB is the biasing battery in Base Emitter loop . Please help me understand this .