The impeller (1) is rotated from the crankshaft and it converts the mechanical Electricity from the crankshaft into kinetic Electrical power by putting the fluid in movement. Although these are generally not all possible signs, They're the most common kinds. Here's a far more in depth listing of the signs https://emiliotyaay.blogdiloz.com/33237771/torque-converter-clutch-things-to-know-before-you-buy