1. For a bipolar junction transistor, is it always the case that the base-emitter junction encounters a voltage drop, while the collector-emitter never does?
2. Is there a type of transistor that works like a relay, with 4 pins, such that a current between two input pins will connect the two output pins? Or do all transistors have one leg in common?
3. If there is a base-emitter voltage sufficient to saturate the transistor, can the polarity of the collector-emitter current be reversed?
4. It troubles me to speak of a 'saturation voltage' when the collector-emitter current is still tied to be some constant of the base-emitter current. This means that to obtain a certain current as output, one might need an input current that is higher than the stated "saturation voltage." Am I right in thinking that?