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A transfomer steps down 220 volt to 11 volt. What is the transformation ratio ?

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A transfomer steps down 220 volt to 11 volt. What is the transformation ratio ?
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`e_(p) = 220 V, e_(s) = 11 V`
`K = (e_(s))/(e_(p)) = (11)/(220) = 1//2 = 0.05`
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