A diode is a two-terminal component in electronics with a unidirectional flow of current. It offers low resistance in the direction of current flow and offers high resistance in the opposite direction. Diodes are mostly used to prevent damage to components, especially due to electromotive force in circuits which are usually polarized.
A thyristor is a solid state and four-layered semiconductor used in electronic devices and equipment to control electrical power or current output through a phase angle control technique.
A thyristor is also known as a semiconductor-controlled rectifier (SCR) or silicon controlled rectifier (SCR).
Thyristors are primarily designed to amplify and rectify the electrical currents that flow in high-powered electronic devices. A thyristor's four layers consist of a series of N and P-type material that connect with the anode, cathode and a logic gate. When a current is applied at the gate, the thyristor allows an amplified current to flow form anode to cathode.
Although thrysitors can only transmit currents in one direction, they have three different operating modes: reverse blocking, forward blocking and forward conducting.
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