Minggu, 12 Maret 2017
In practice, it is often required to make or break an electrical circuit in many operations. In some appli-cations, it is desirable and necessary that this make and break should be very quick and without sparking. The mechanical switches cannot be used for the pur-pose for two main reasons. Firstly, a mechanical switch has high inertia which limits its speed of operation. Sec-ondly, there is sparking at the contacts during breaking operation which results in the burning of the contacts.
The researches in the past years have revealed that tubes and transistors can serve as switching devices. They can turn ON or OFF power in an electrical circuit at a very high speed without any sparking. Such switches are known as electronic switches.