A power adapter is a device that converts electrical energy from one form to another, allowing electronic devices to receive the correct voltage and current. They are commonly used to charge devices like smartphones, laptops, and tablets. Power adapters can be found in various shapes and sizes, depending on the device they are designed to support. Most power adapters consist of a transformer, which reduces the voltage, and a rectifier, which converts alternating current (AC) to direct current (DC). Some adapters also include additional features, such as overcurrent protection and short-circuit protection, to ensure the safety and longevity of the connected devices.