There are two types of transformer, step up and step down. Transformer, device that transfers electric energy from one alternating-current circuit to one or more other circuits, either increasing (stepping up) or reducing (stepping down) the voltage. transformer Bedeutung, Definition transformer: 1. a device that changes the voltage or other characteristic of electrical energy as it moves from…. Learn more about transformers in this article. A transformer is a device that transfers electrical energy from one electrical circuit to another through mutual (electromagnetic induction) and without change in frequency.Transformers are an important part of electrical systems. Structure of simple transformer is given below; Voltage is applied to primary coil and, we take transformed voltage from secondary coil. ; a step-down transformer which reduces or steps-down voltage. Transformers are employed for widely varying purposes. We use step down transformers in electrical devices like radio, and step up A current transformer is an instrument transformer, used along with measuring or protective devices, in which the secondary current is proportional to the primary current (under normal conditions of operation) and differs from it by an angle which is approximately zero. There are two types of transformer: a step-up transformer which increases or steps-up voltage. Design and use of transformers. Transformers Transformers are devices used for changing the potential of alternating currents.