Eli5 What is the mechanism that physically puts voltages on wires in the CPU.

Question

I have a fairly strong understanding of how code like C is compiled into machine code and how transistors form gates which can be put together to compute lots of operations which can eventually become a computer. Say you have a machine instruction that says to add the contents of register 3 and register 5 and put the result in register 6. What is physically putting the voltages on the transistors in a way that achieves the desired result given that nothing is flipping a mechanical switch?

In: 2

Answer 1

The wires do. The wires are connected to the voltages. But there are also transistors in the way, which sometimes block the voltages, so that different voltages get to the wires.