An AC outlet is a plug that produces the same amount of electricity as your home. The output voltage in North American versions is usually 115 volts. Most modern automobiles equipped with this feature have a maximum power rating of roughly 150 watts, which is sufficient for most portable electrical devices. Typically AC outlet act as a mobile charging station to provide electrical power for portable equipment used in or around your vehicle. However, there are some limitations to the outlet and some precautions to follow when utilizing electronic devices. You can check it in your owner's manual to see what voltage and guidelines are provided in your vehicle.