eli5 how CPUs work despite being so small


if resistance increases the thinner a wire gets, then how are tiny modern cpus with billions of transistors able to function at their scale

In: 4

How CPU’s work would take too much for this sub.

As to how they work they same yet are constantly getting smaller, that can be addressed.

When Computers started, we did not have the ability to make the electronics small. Transistors were found to work by using relatively large chunks of silicon. Over time, as we were able to purify the silicon, it was found that smaller and smaller pieces of silicon were needed. Then they learned how to grow silicon in patterns that we could use to make transistors. This made the transistors even smaller. As time went on, using better methods and processes, they were able to make the transistors smaller and smaller.

Now, through various manufacturing processes, they are quickly approaching using transistors that are measured in Atoms. IE: it is 3 atoms thick. Soon they will be using devices that are single atom size.

This all results in the inside electronics being smaller. A smaller inside requires a smaller outside.

I hope this helps.

Resistance is also linearly proportional to the “wire”‘s length.

When you fit billions of transistors into a square centimetre, those lengths are tiny.