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)...
icon
Related questions
Question
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
coil.
b. Explain why there is a difference between the true ohmic resistance and the
effective resistance values for the same coil winding.
Transcribed Image Text: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 coil. b. Explain why there is a difference between the true ohmic resistance and the effective resistance values for the same coil winding.
Expert Solution
steps

Step by step

Solved in 2 steps with 2 images

Blurred answer
Knowledge Booster
Three Phase Transformer
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Power System Analysis and Design (MindTap Course …
Power System Analysis and Design (MindTap Course …
Electrical Engineering
ISBN:
9781305632134
Author:
J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:
Cengage Learning
Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning