Khan Academy - "Learn Almost Anything for Free" - RF Cafe
RF Cafe visitors might be particularly interested in subjects like circuit analysis (4 lessons), capacitance, magnetism (12 lessons), electric motors, electrostatics, Doppler, optics, and fields. You might also like watching the video lessons on momentum and torque, friction, gravity, thermodynamics (5 lessons), Newton's laws , and fluids (12 parts).
For a little nerd fun watch the video on what the takeoff roll for an Airbus 380 would be for various weights or how fast a baseball would need to leave the bat of a hitter at home plate to clear the Green Monster at Fenway Park.
Some lessons do go well beyond introductory concepts by including vector products and calculus in the presentation. Magnetism, for example, uses cross products in the high numbered lessons.
If you need a math refresh, maybe the lessons on complex numbers would be helpful. If you're doing statistical analysis, then the box-and-whisker lesson might help. There are modules for probability and statistics as well, and for about a hundred other topics including trigonometry, geometry, factoring polynomials, exponents, logarithms, linear algebra, and matrix operations.
Finally, if you are involved in the business side of the company, lessons on microeconomics and macroeconomics cover topics like the business cycle, fiscal policy, inflation and deflation, investment, and money supply.
Even if these video lessons are of no interest to you, they might be just what your kid is studying in school. The fresh insight from a different instructor could be just what he/she needs. It's worth a try.
The August 2012 edition of IEEE's Spectrum magazine ran an article on Khan Academy if you want more information (other than just visiting Khan Academy's website).
These items are an archive of past Topical Smorgasbord items that have appeared on the RF Cafe homepage. In keeping with the "cafe" genre, these tidbits of information are truly a smorgasbord of topics. They all pertain to topics that are related to the general engineering and science theme of RF Cafe.
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Please send me an e-mail if you have a good subject.