Solid State Physics
During chip fabrication well layers are applied with appropriate voltages i.e. n-well with vdd and p-sub with vss why did they require at that time?
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Explain the reasons for the use of a range of voltages in an electricity supply system?
Several reasons for different voltages. At the heart of it is that to deliver the same power, voltage and current are inversely related. The other aspect is safety. So for the grid, high voltages are used to maximize power transmission within the current limits of the cables. In industrial environments, equipment may require a lot of power - that requires high voltages as well Domestic requirements are not so power-hungry so 120 or 240 volts are adequate, and are also safer (well... less dangerous) than higher voltages.