växelströmadapter

A växelströmadapter, commonly known as an AC adapter or power adapter, is an external or internal device that converts alternating current (AC) from a power source, such as a wall outlet, into direct current (DC) that electronic devices can use. Many electronic devices, like laptops, smartphones, and routers, require a stable DC voltage to operate, and the AC adapter serves as the intermediary to provide this.

The primary function of an AC adapter is to step down the higher voltage from the mains supply to a lower, safer voltage suitable for the connected device. It also rectifies the AC to DC and often regulates the voltage to ensure it remains consistent. This process is crucial because AC fluctuates in voltage and direction, while most electronic components are designed to work with a steady, unidirectional DC flow.

AC adapters come in various forms. They can be small, brick-like units with a cord that plugs into the wall and another that connects to the device, or they can be integrated directly into the device's power supply unit. The output voltage and current ratings are critical specifications and must match the requirements of the device they are intended to power. Using an adapter with incorrect specifications can damage the electronic device.