Like, yes, i know it’s electric and such. But I recently talked to an engineer and he, as I understand, said that there are still switches and other mechanics but microscopic inside CPUs and circuit boards.
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Yes, there are switches, they are called MOSFETs (which are a type of transistor). However, these switches are not exactly mechanical: the only moving parts they have are “electricity particles” (electrons). They use the fact, that electrons are repelled by each other, but are attracted to atoms.
MOSFET consists of two conducting “isles”, separated by a “desert”. Electricity cannot pass the “desert”, so the MOSFET switch normally breaks the circuit. MOSFET switches on by building a “hanging bridge” out of electrons between the isles.
The bridge building is controlled by the gate, that hangs above the “desert”. Gate is separated by glass, which electricity cannot pass, but it can still “sense” attraction or repulsion. When the gate attracts electrons, they stick to the glass, creating a bridge connecting two isles. When the gate repels, the bridge shatters, isolating isles from each other.
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