Description : Define: 1) voltage ratio, 2) current ratio, 3) transformation ratio of transformer.

**Answer :** 1) Voltage ratio: The voltages in primary and secondary winding is proportional to number of turns in primary and secondary respectively. So, the voltage ratio is same as transformation ratio. V2/V1 = N2 ... as transformation ratio of transformer. It is denoted by K. K = N2/N1