open-loop control systems, the output signal has no effect upon the controlled variable(s). In other words, in an open–loop control system the output is neither measured nor “fed back” for comparison with the input.
Operation of a washing machine, where the duration of soaking, washing, and rinsing are set in advance and on the basis of experience with how these settings affect the output signal, which is the cleanness of the clothes. In such an open-loop system, the output signal is not automatically measured. Example :- clothes drier , Electric bulb