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For an SCR the total turn-on time consists of i) Delay time ii) Rise time and the iii) Spread time The spread time interval depends upon

For an SCR the total turn-on time consists of i) Delay time ii) Rise time and the iii) Spread time The spread time interval depends upon Correct Answer area of the cathode

During the spread time the conduction starts spreading all over the SCR cathode cross-section structure, which depends upon the structure of the gate & cathode. Higher the cathode area more is the time required for the charges to spread all over.

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