The document discusses variable frequency drives (VFDs) and their advantages. It notes that VFDs can vary the output speed of motors without mechanical components, reducing maintenance costs. The biggest advantage is energy savings, as VFDs consume only the power needed. It then explains in detail how VFDs work by converting incoming fixed voltage and frequency power to variable voltage and frequency to control motor speed. This allows input current to a VFD to be lower than output current under certain load conditions due to differences in input and output power factors.