The sistem which you can watch down is completely automatic.The cam on the side of the puley pushes the two metal contacts together for a short period of time.This happens once every time the pulley makes a complete circle, producing an intermittent light.
An electromagnetic control system activates the various parts of machine, at the right moment and for the right amount of time, ensuring that the machine functions properly.
CAM SWITCH CONTROLLER
The device on the side of pulley in the picture above is called cam.The shape of this device allows us to control the moment and duration of an activity, such as the running of a motor or the illumination of light bulb.
The picture below shows an electrical control system for a water tank.The battery provides power for the pump, which moves water from the lower tank to the upper tank.When the upper tank is full, a limit switch turns off the pump.
The switch is activated when the float rises to a certain level.When the water level goes down, the switch returns to its original position and the pump turns on again.There are two types of limit switch:
In this video you will learn:What is a limit switch
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