![]() But, to understand the switching devices like SCR, DIAC and triac we have to know about the thyristor. Earlier we have studied the basic electrical and electronic components such as transistors, capacitors, diodes, etc. The essential semiconductor switching devices are UJT, SCR, DIAC, and TRIAC. ![]() These devices perform as controlled switches and can complete the duties of controlled rectification, regulation, and inversion of power in a load. ![]() In the present day, such devices have been developed which can allow fine control over the flow of large blocks of power in a system. But, these methods do not allow fine control over the flow of power in a system additionally there is an extensive wastage of power. For instance: using electrical methods controlling the speed of a motor or fan. There are several applications where it is preferred to regulate the power fed to a load.
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