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. It typically connects to a wall outlet and provides power to devices like laptops, smartphones, and tablets. Power adapters are essential for charging batteries and ensuring that devices operate safely and efficiently. Most power adapters consist of a transformer, which reduces the voltage, and a rectifier, which converts alternating current (AC) to direct current (DC). They come in various shapes and sizes, depending on the device they are designed to power, such as laptops, smartphones, or tablets.