Transistors, bjt, MOSFETs OK got it.
More transistors = better computing got it.
But compressing the transistors closer to each in my mind only helps reduce the physical dimensions.
So does a CPU or any electronic become more efficient because the transistors use less voltage? Does more computing reduce power usage, thus simply having more transistors the reason?
I am asking because as a newb and soon to graduate engineer, I think basic stuff like this is important to understand. But I always learned this concept as a rule of thumb and not by "first principle" or actual theory of transistor efficiency.
PS I did take a class in where the math of L and W was calculated and compared to new L' and W', reduced on a npn. The theoretical frequency increased but I don't think the math translation well in my head because I don't see how that helps power efficiency, only performance and/or area.