What is the primary purpose of pulleys and belts in single-phase motor applications?

The primary purpose of pulleys and belts in single-phase motor applications is to transmit mechanical power and alter the speed or direction of motion. When a single-phase motor operates, it generates mechanical energy that needs to be transferred to different components or machinery to perform useful work. Pulleys and belts provide a flexible means of connecting the motor to these components.

By adjusting the size of the pulleys and the configuration of the belts, operators can control the output speed and torque of the system. A larger pulley will typically result in a slower output speed compared to a smaller pulley when working with the same motor speed. This adaptability allows for efficient operation across a variety of tasks and makes it possible to tailor the motion transmission to meet the specific requirements of the application.

The other options do not accurately represent the core function of pulleys and belts in this context. They are not used to transmit electrical signals, store energy, or primarily enhance aesthetics; their main role is focused on the mechanical transmission of power in various applications fueled by single-phase motors.