7. An electromagnet consists of a coil with a laminated core assembly. This device takes 6 A when connected to a 120 V DC course. When energized from a 120 V, 60 Hz AC source, the current is 2 A. The wattmeter reads 100 W. a. Determine the true ohmic resistance of the coil and the effective resistance of the b. coil. Explain why there is a difference between the true ohmic resistance and the effective resistance values for the same coil winding.
7. An electromagnet consists of a coil with a laminated core assembly. This device takes 6 A when connected to a 120 V DC course. When energized from a 120 V, 60 Hz AC source, the current is 2 A. The wattmeter reads 100 W. a. Determine the true ohmic resistance of the coil and the effective resistance of the b. coil. Explain why there is a difference between the true ohmic resistance and the effective resistance values for the same coil winding.
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.7MCQ: Consider Figure 3.5. Match the following, those on the left to those on the right. (i) Im (a)...
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