Which device is responsible for converting DC to AC?

The device responsible for converting direct current (DC) to alternating current (AC) is an inverter. Inverters work by using electronic circuits to switch the DC voltage at a rapid pace, thus creating an AC output. This capability is essential for applications such as supplying power to appliances or systems that require AC, including many household devices and industrial machinery.

Understanding the roles of other devices helps to clarify the inverter's unique function. A rectifier, for example, performs the opposite action by converting AC to DC, making it essential for applications where DC is needed, but it does not serve the function of converting DC to AC. A transformer is used to change the voltage levels of AC systems and does not work with DC at all. Lastly, a relay is an electromechanical switch that controls circuit operations but does not involve the conversion of current types.