Why all voltage level are multiples of 11, like 220V, 440V,
1100V instead of 200V, 400V, 1000V?



Why all voltage level are multiples of 11, like 220V, 440V, 1100V instead of 200V, 400V, 1000V?..

Answer / satheesh kumar

the form factor(ratio of rms value to mean value of Ac for a period of 2π rad is 1.1. so all voltage levels are multiples of 11

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