5. A welder machine operates automatically as follows : 30A current in 10 seconds, 20A in 10 sec., 10A in 10 sec. And finally 30A for 20 sec. To complete one cycle. What the equivalent rms value over one cycle?

5. A welder machine operates automatically as follows : 30A current in 10 seconds, 20A in 10 sec., 10A in 10 sec. And finally 30A for 20 sec. To complete one cycle. What the equivalent rms value over one cycle?

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter7: Alternating Current, Power Distribution, And Voltage Systems

Section: Chapter Questions

Problem 3RQ

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Concept explainers

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.

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5. A welder machine operates automatically as follows : 30A current in 10 seconds,
20A in 10 sec., 10A in 10 sec. And finally 30A for 20 sec. To complete one cycle. What
the equivalent rms value over one cycle?

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