Introducing Complex Numbers to Engineers: Relevant Examples Explained

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Discussion Overview

The discussion focuses on methods for introducing complex numbers to engineering students who may struggle with mathematics. It explores relevant examples and applications that could make the concept more tangible and understandable for them.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant suggests that roots of unity offer a geometrical approach to understanding complex numbers that is straightforward.
  • Another participant proposes using the representation of sine and cosine functions as rotating vectors on the imaginary and real axes, highlighting its significance in AC circuits through phasor diagrams.
  • A different viewpoint emphasizes the application of complex numbers in electric circuits, particularly in understanding impedance from inductors and capacitors, and their role in analyzing LRC circuit responses.
  • One participant mentions the relevance of transfer functions as an example that engineering students typically encounter, suggesting it as a potential introduction point.

Areas of Agreement / Disagreement

Participants present various examples and applications of complex numbers, but there is no consensus on a singular best method for introduction. Multiple competing views on effective teaching strategies remain.

Contextual Notes

Some suggestions may depend on the specific engineering discipline, and the effectiveness of examples may vary based on students' backgrounds and experiences with mathematics.

Who May Find This Useful

Engineering educators, curriculum developers, and students seeking to understand the application of complex numbers in engineering contexts.

matqkks
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What is the best way of introducing complex numbers to engineers who are weak at mathematics?
They normally want something tangible or relevant examples.
 
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Roots of unity provide a nice geometrical use of complex numbers that is easy to follow.
 
Not a great way perhaps to introduce them, but one use I can think of off the bat is plotting sin and cos functions as rotating vectors on the imaginary and real axes. This is important in AC circuits (via phasor diagrams). It's revelvant in the introductory calc-based physics sequence for most engineering programs.
 
You can show them the use of complex number in electric circuits. When we talk about impedence due to inductors and capacitors complex numbers are indispensible. They are also used in studying responces of LRC circuits.
You may have to look up more things to appeal to non- EE majors as myself.

An example is in the study of transfer functions; which I believe every engineering student encounters.
 

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