Electrical and computer engineers do a wide variety of things. In particular they design, build and test electrical, electronic and digital circuits. The video shows how to construct a modern version of the Theremin Circuit which was the basis for one of the very first electronic musical instruments. For more information do a web search on the phrase "Theremin Circuit".
Stealth aircraft are designed by electrical engineers. The primary feature of a stealth aircraft is that they be designed so they DO NOT reflect radar waves. This means that electrical engineers must design the body of the aircraft so that it is a very poor reflecting antenna.
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