1. The problem statement, all variables and given/known data Draw a circuit diagram (using only transistors and resistors) showing how a 2-input AND-gate can be realised. Component values are not required. 2. Relevant equations None. 3. The attempt at a solution (Refer to attachment for correct answer). I am not too sure how the current would flow (from the beginning to the end of the circuit). At what point does the current originate (i.e. start)? Why also is the output taken at the collector?