## How do you calculate the capacity of an autotransformer?

## What is the theory of auto transformer?

- Theory of
**Auto Transformer**. In**Auto Transformer**, one single winding is used as primary winding as well as secondary winding. But in two windings**transformer**two different windings are used for primary and secondary purpose. A diagram of**auto transformer**is shown below. The winding AB of total turns N1 is considered as primary winding.

## What is the formula for power transformation in a transformer?

- Power transformation formula: The total power S (Con-VA) in VA is conducted from the autotransformer is equal to the transformation ratio times of the product of the secondary voltage and secondary current. S (Con-VA) = k x V 2 x I 2 At the same time,

## How to find the unknown value of the auto transformer?

- Transformation ratio = primary input voltage / secondary output voltage = Primary current /secondary current = Secondary turns / primary turns Also using above formula you can find the unknown value of the
**auto transformer**.

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