Voltage & Current Transformation Ratio OF A TRANSFORMER



Voltage transformation ratio is the ratio of e.m.f. induced in the secondary winding to the e.m.f. induced in the primary winding.

This constant K is known as voltage transformation ratio or turns ratio.

(i) If N2 > N1 i.e., K > 1 then the transformer is called step-up transformer.

(ii) If N1 >N2 i.e., K< 1 then the transformer is called step-down transformer.

Current ratio:

    Current ratio is the ratio of current flowing through the primary winding (I1) to the current flowing through the secondary winding (I2).

In an ideal transformer

Apparent input power = Apparent output power.






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