Which of the following factors is used to classify transformers?

Transformers are classified based on their application in electrical systems, which encompasses a range of factors including the power levels they handle and their intended use. The classification by power application is a vital aspect because it helps in determining the suitable transformer for specific tasks, such as voltage transformation, isolation, or impedance matching. Different applications may require transformers to have varying design specifications, efficiency, and performance characteristics, which are influenced by the specific needs of the electrical system they are serving.

For example, you might find power transformers designed for high voltage transmission in power plants, while other types are tailored for lower voltage applications in consumer electronics. By focusing on power application, you can ensure that the transformer operates efficiently within the desired parameters for the intended circuit design.

In contrast, while factors like load current, voltage rating, and size and weight may contribute to understanding a transformer's characteristics, they are not primary classification criteria like the application the transformer is designed for. Understanding the intended use gives insight into which specifications are crucial for creating a transformer suited for particular tasks.