Lecture (L7-1,2) Sine Waves and Phasors

Due Nov 20, 2015 by 11:59pm
Points None

There are no required video lectures for today, although the videos below will be useful references. We will cover sine waves and complex numbers in class.

Here are some MATLAB files you can use to generate plots of sinusoids and phasors:

Matlab code to plot a sine wave (you can change F,A,phi, etc.) cosine time domain plot.m Download cosine time domain plot.m

The following files illustrate how a sinusoid corresponds to the shadow of rotating stick (that represents a phasor):

PhasorMovie0.m Download PhasorMovie0.m Matlab code to generate picture of rotating stick

PhasorMovie0.mpg Download PhasorMovie0.mpg Play media comment. Movie of rotating stick. Shadow on real axis is Acos(wt+phi).

PhasorMovie.m Download PhasorMovie.m Matlab code to generate picture of rotating stick and the waveform of the shadow on the real axis over time. Phasor is picture of stick at time t = 0.

PhasorMovie.mpg Download PhasorMovie.mpg Play media comment. Movie of rotating stick shadow plotted over time.

three_D.m Download three_D.m Matlab code to make a 3-D plot projected onto 2-D display.

Reference videos on complex numbers:

Chapter 7-1 in Ulaby Textbook:

Review Complex Numbers:

http://www.youtube.com/watch?v=5Duylj_qRL0 Links to an external site.