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Why are super-miniature electronic ICs fully functional at nanoscale while mechanical devices are not?

Why are super-miniature electronic ICs fully functional at nanoscale while mechanical devices are not? Correct Answer Greater friction

The power of any machine is proportional to its volume whereas the friction is dependent on the surface area. In case of a regular sized machine, power is enough to overcome any friction. However, at nanoscale the friction overcomes power. This is because the volume of an object decreases as the third power of its dimensions while the surface area only decreases as the second power. Thus, the machines at nanoscale become redundant.

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1. Electric generator ⟺ Mechanical to electrical
2. Electric motor ⟺ Electrical to mechanical
3. Diesel engine ⟺ Light to electrical
4. Solar cell ⟺ Chemical to mechanical
Which of the above pair/s is/are correctly matched?
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