I started studying electronics 3 years ago as something to do during recovery from surgery. I studied long, not really too hard, and received my Extra class ham radio license. Much of what was covered today I just learned recently while preparing for the ham exams. This is an excellent refresher, and at my age (65), refreshment helps. Thanks for presenting this for free. Max is very good a teacher.
GeoSei - didn't know that it was, unless it is part of the device package in the form of BeO - berylium oxide - a super thermally conductive material which causes severe alergic reactions in some individuals, when in the form of dust.
If you take any elements in the same family as ilicons -- you can use them -- so silicon, germanium, and carbon (in th eform of diamond). Tings like Gallium Arsnide involve mixing two different elements.
Thanks for the presentation. Just a quick remark: I am aware of the time constraints but I think that as the complexity of the content of the following slides goes up, the lecturer shouldn't be cutting down on time spent on those following slides - especially first diode, or transistor - as that is where first and most of the people get lost/confused with the basics of electricity, of the whole "how it works" needed for later.
The effect know as water hammer is a manifestation of the accelerative head in of a liquid in a long tube being brought to a sudden stop. This is analigous to sudden the voltage spike that is observed accross a switching device in series with an inductor after the switch is shut off.
Electron migrate down the copper at about 13,000ft/sec. The electromagnet force (photons) move down the conductor at around 2/3 the speed of light. The photon knock the electrons off the atoms as the go. The electron move is a secondary event.
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On April 15, 2010, President Barack Obama gave a major speech at the Kennedy Space Center in Florida, announcing that the US would send astronauts to Mars by the mid-2030s. But in order to do so, NASA would first need to ramp up its capabilities through missions directed toward "a series of increasingly demanding targets," i.e. asteroids.
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