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Electricity and Magnetism Lecture 18 (approx. 51 minutes) contains information on several topics. To learn about Three Phase Currents: Synchronous and Induction Motors, watch the lecture from 23:27 to 33:52. To learn about Three Phase Motors, watch the lecture from 33:52 to 37:13. To learn about a Secret Top Explained, watch the lecture from 37:13 to 47:03. To learn about a Two Phase Current, watch the lecture from 47:03 to 51:12. Course: 8.02 Electricity and Magnetism, Spring 2002Instructor: Prof. Walter Lewin Prof. Walter Lewin, 8.02 Electricity and Magnetism, Spring 2002. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed November 21, 2008). License: Creative Commons BY-NC-SA http://ocw.mit.edu/OcwWeb/web/terms/terms/index.htm#cc http://creativecommons.org/licenses/by-nc-sa/3.0/us/legalcode


  • Science > General
  • Science > Physics

Education Levels:

  • Grade 9
  • Grade 10
  • Grade 11
  • Grade 12


student-facing MIT AP Physics AP Physics electromagnetism induction inductance Maxwell



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On a scale of 0 to 3
On a scale of 0 to 3

This resource was reviewed using the Curriki Review rubric and received an overall Curriki Review System rating of 2, as of 2009-07-04.

Component Ratings:

Technical Completeness: 3
Content Accuracy: 2
Appropriate Pedagogy: 2

Reviewer Comments:

A number of incorrect assertions spoils this otherwise clear lesson on order of operations. For one, the statement "Remember rule number 3 and 4. 8 ÷ 4 x 6 and 3 – 1 + 7. These give different answers using PEMDAS vs. going from left to right" is not right and doesn’t exactly make sense. The final exercise is explained twice, but only the second explanation makes sense.

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