Question

What is stepup and stepdown trnsoformer

Answer 1

A transformer is a device that changes (transforms)and alternating potential difference (voltage) from one value to another value be it smaller or greater using the principle of electromagnetic induction.

A transformer consists of a soft iron coil with two coils wound around it which are not connected to one another. These coils can be wound either on separate limbs of the iron core or be arranged on top of each other.

The coil to which the alternating voltage is supplied is called the primary coil or primary winding. When an alternating potential difference is supplied the resulting alternating current in the primary coil produces a changing magnetic field around it. This changing field induces an alternating current in the secondary coil. The size of the induced voltage resulting from the induced current in the secondary coil depends on the number of turns in the secondary coil.

Transformers can be of two types:

Step-up Transformer

On a step-up transformer there are more turns on the secondary coil than the primary coil. The induced voltage across the secondary coil is greater than the applied voltage across the primary coil or in other words the voltage has been “stepped-up”.

Step-down Transformer

A step down transformer has less turns on the secondary coil that the primary coil. The induced voltage across the secondary coil is less the applied voltage across the primary coil or in other words the voltage is “stepped-down”.