Final answer:
The gear train inside an electric car window converts rotational motion into linear motion, while the gear train inside an electric fan increases the speed or torque of the motor.
Step-by-step explanation:
The gear train inside an electric car window differs from the gear train inside an electric fan in terms of their purpose and design. In an electric car window, the gear train is used to convert the rotational motion of the motor into linear motion, allowing the window to be raised or lowered. The gear train inside an electric fan, on the other hand, is used to increase the speed or torque of the motor, resulting in the rotation of the fan blades.
An electric car window typically uses a rack and pinion gear system to convert the rotational motion into linear motion. The motor turns a gear (pinion) that engages with a straight toothed bar (rack), causing the window to move up or down. In contrast, an electric fan uses a multi-stage gear train to increase the speed or torque of the motor. This allows the fan blades to rotate at a higher speed, resulting in greater air movement.