The impeller (one) is rotated because of the crankshaft and it converts the mechanical energy of your crankshaft into kinetic Strength by putting the fluid in movement. The Torque Converter Clutch (TCC) mechanically locks the motor for the transmission by connecting the impeller Using the turbine via a wet clutch. https://torqueconverterclutch52840.newsbloger.com/34885021/torque-converter-clutch-an-overview