There are many different standard sizes and configurations for electrical transformers. The size and configuration depends on the transformer's intended purpose. Some of the main types of transformers include step-down transformers, voltage transformers and Isolation transformers.
Step-down transformers are used in the electrical power grid system, and their standard sizes range from 0.5 kilovolt-amperes to 500 kVA. These transformers are commonly used for transforming 220 or 240 volt electricity down to 110 or 120 V. The transmission of power over long distances would be impossible without step-down transformers.
A voltage transformer can be used for everyday appliances. An example of a rating for a voltage transformer would be a standard 120-volt to 12-volt conversion, as is common in electronic applications.
Isolation transformers are designed to induce voltage form a wire without physically connecting to it. The term "turns" relates to the coils of wire used in a transformer, and a common turns ratio for an isolation transformer is 1-to-1.
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