Download the original rotating magnetic field simulator by Dr. George McPherson called RotSIM


Dr. McPherson has a nice book on electric machinery.  It is now out of print, but you can find a used copy at Amazon

Download a PowerPoint background with a bunch of resistors, inductors, and capacitors.


The first two pages show examples of a black background.  The third page shows and example of a white background.  The last two pages have a white background with grey electrical components and figures with a transparent background.