Refer to figure.
The inverter is a unit used to convert DC into AC. Essentially receive an 18-30 V DC current and they output 115 V, 400 Hz AC. The static inverter consists of all the standard electrical and electronic components such as oscillators, diodes, transistors, capacitors, and transformers.
Inverters can also be rotary, by converting the DC to AC using a constant speed DC motor to drive an alternator, thereby producing constant frequency AC. However, the most common inverters fitted into aircraft electrical systems are the static inverters described above.