# Types of Transformers Based on the Value of K

## Transformation Ratio (K)

The transformation ratio for voltage is defined as the ratio of secondary voltage to the primary voltage of a transformer. It is denoted by K.

## Turns Ratio of the Transformer

The turn’s ratio of a transformer is defined as the ratio of the number of primary turns to the number of secondary turns.

## Types of Transformers Based on the Value of K

Based on the value of the transformation ratio K, the transformers are classified as, step up. Step down or one as to one transformers.

#### Step up transformer

The transformer having K > 1 or V_{2} > V_{1} is called as the step up transformer. We get higher secondary voltage as compared to the primary winding, hence the name step up.

#### Step down transformer

The transformer having K < 1 or V_{2} < V_{1} is called as the step down transformer. We get lower secondary voltage than the primary voltage, hence the name step down.

#### One-to-one transformer

The transformer having K = 1 or V_{1} = V_{2} is called as a one-to-one transformer.