Yes please, sign me up for the 6 week course. Any time you feel like explaining more I will certainly read it and absorb.
Chapter 2: Introduction to higher frequency components of voltage and current:
Any time you make or break a current path, there will be transient rapid changes in voltage and current.
1. Rapid changes in voltage produce rapidly changing electric fields. These changes can induce voltages and currents in nearby objects via capacitance. These electric fields can be shielded fairly easily. (Ultimately via a Faraday cage if you want really good shielding.) But if you do not provide any shielding they can still pass through transformers via the inter-winding capacitance.
2. Rapid changes in current produce rapidly changing magnetic fields. These changing magnetic fields also produce voltages remotely. Magnetic fields are much harder to shield.
3. If the changes in voltage and current get to really high frequencies the changes in electric and magnetic fields
together travel long distances in the form of electromagnetic waves (radio waves, x-rays, etc.)
A transformer or a brushless motor will not generate harmonics at very high frequencies. Those low order harmonics that exist will result from non-linear effects such as saturation or hysteresis in magnetic materials. And they will not travel very far as harmful emissions (except as in the audio and instrument discussion earlier.) Only arcing contacts (including brushes), gas discharge tubes (fluorescent, metal vapor, etc), rapid electronic switching and similar sources can produce very large high frequency emissions.