Can a transformer be used as in both ways?

Yes, a transformer can be used in both ways, functioning as a step-up or step-down device depending on the configuration of its windings. In a step-up transformer, the primary winding has fewer turns than the secondary, increasing voltage while decreasing current. Conversely, in a step-down transformer, the primary has more turns than the secondary, reducing voltage while increasing current. This versatility allows Transformers to adapt to various electrical applications.