Apr 17,2023

What is a Step-Down Transformer?

A step-down transformer is a type of transformer that is designed to decrease the voltage level of an alternating current (AC) power supply.

It has a higher number of turns on the primary winding compared to the secondary winding, which results in a reduced output voltage. The transformer works on the principle of electromagnetic induction, where a varying magnetic field induces an electromotive force (EMF) in a conductor.


In a step-down transformer, the primary winding is connected to a high voltage AC power source, while the secondary winding is connected to the load that requires a lower voltage. The transformer then steps down the voltage level from the primary winding to the secondary winding by transferring energy through the magnetic field.

Step-down transformers are commonly used in power distribution systems to reduce the voltage from high-voltage transmission lines to a level that can be used safely by households and businesses.

They are also used in various electrical and electronic devices to supply lower voltage levels to sensitive equipment such as computers, televisions, and mobile phones.