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The voltage transformation ratio of a transformer is equal to the ration of:

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The voltage transformation ratio of a transformer is equal to the ration of:
  • Aprimary turns to secondary turns
  • Bsecondary current to primary current
  • Csecondary induced e. m. f. to primary induced
  • Dsecondary terminal voltage to primary applied voltage
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In transformers, voltage transformation ratio is the ratio of secondary induced emf to primary induced emf.

$(K = \frac{{{E_2}}}{{{E_1}}} = \frac{{{N_2}}}{{{N_1}}} = \frac{{{I_1}}}{{{I_2}}})$