I have been trying to understand how 240 voltage works in devices such as motors or heating elements I know that current needs a complete path to flow to produce power and in the typical 120 volt circuit the common is what completes the path. In a 240 volt circuit nothing more than two 120 volt legs are needed to make the motor or heating element work. I understand that the two 120 volt legs are 180 degrees out of phase. Is it the push-pull action between the two out of phase 120 volt legs which allows current to flow through the device and produce power or work? Just curious and can't seem to find the answer anywhere. Thanks!