A transformer may be step up or step down. If the output voltage is greater than the input voltage, the transformer is said to be a step-up transformer. A transformer is said to be a step-down transformer if the output voltage is less than the input voltage. This classification is carried out on the basis of the ratio of input and output voltages. From application point of view, the following transformers are most important:
From frequency range point of view, transformers can be divided as (50–400 Hz) audio transformer, wide band and narrow band transformers and pulse transformers. Transformers can also be divided depending on the number of windings such as two winding (conventional) and single winding known as autotransformer.
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