What does the secondary coil in a transformer do?

In a transformer, the secondary coil plays a crucial role in delivering energy to the load. When alternating current (AC) flows through the primary coil, it generates a changing magnetic field. This magnetic field induces a voltage in the secondary coil due to electromagnetic induction. The primary purpose of the secondary coil is to convert the energy transmitted through this magnetic field into usable electrical energy, which then can be supplied to the electrical load for operation.

The secondary coil thus functions to step up or step down the voltage based on the turns ratio between the primary and secondary coils, while maintaining the overall power. This delivery of energy to the load is essential for the proper functioning of electrical circuits and devices that rely on the transformer to adjust voltage levels as needed.