Understanding Motor Controls
Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 51, Problem 1RQ
To determine

Operation of diac.

Expert Solution & Answer
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Explanation of Solution

Diac has a set voltage depending on the material used. When voltage of that particular value is applied, diac allow current to pass. It operates in both the direction of current flow unlike diode. Once the required voltage is given, it conducts in both direction.

The diac have negative resistance. Due to this, the minimum voltage value needed to keep the diac in on state is less than that of the minimum voltage needed to start the operation of diac. Therefore, the diac starts operation at a particular voltage value and stops when voltage is less than the conduction level.

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