What are step-up and step-down transformers?

A Step Up Transformer is one whose secondary voltage is greater than its primary voltage. This kind of transformer "steps up" the voltage applied to it.

The Step Up transformer is designed to increase the voltage from the primary winding to the secondary winding.

A Step-Down transformer is one whose secondary voltage is less than its primary voltage. The step down transformer is designed to reduce the voltage from the primary winding to the secondary winding. This kind of transformer "steps down" the voltage applied to it.

The basic equation for stepping up or stepping down the voltage

Np/Ns is known as the turns ratio.

The induced voltage in the secondary winding (Vs) is in proportion to the primary voltage (Vp) and is given by the ratio of the number of turns in the secondary (Ns) to the number of turns in the primary (Np).

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