Sorry for the noob question. From my understanding, R1s acts as pull down resistors for the base and R2 will limit the current flow to the base. I have seen both configurations, but couldn't work out which one is actually appropriate, if there's any. Given the same resistance for R1 and R2, wouldn't the circuit on the left draw a lot more power? But if we choose appropriate resistor values so that the current draw are similar, will there be any difference between the two circuits?
How about in the case of MOSFETs?