Step-Up Transformer - GCSE Physics Definition

A step-up transformer is a device used to increase voltage from a lower level to a higher level. It consists of two coils of wire, called the primary and secondary coils, wrapped around a core, often made of iron. When an alternating current (AC) flows through the primary coil, it creates a magnetic field that induces a current in the secondary coil. The secondary coil has more turns of wire than the primary coil, which results in a higher voltage in the secondary coil. Step-up transformers are important in transmitting electricity over long distances because they allow electricity to be sent at higher voltages, which reduces energy loss.