How does a torque converter work and what are its main components?

A torque converter uses fluid coupling to transfer power from engine to transmission. Main components are: Impeller (pump) connected to engine, turbine connected to transmission input, and stator between them that redirects fluid flow for torque multiplication. At low speeds, the stator enables torque multiplication up to 2:1; at higher speeds, all components rotate together with minimal slip. A lock-up clutch mechanically connects impeller and turbine at cruising speeds for efficiency.