I have so many questions about my first lab of Physical Computing Class. I should read a text book or related materials, and ask to staff.
Here are some of my experiences and curiosity.
1. When I was measuring a 220-ohm register with a JAMECO multimeter, the result was gradually decreased from 251 to 216-ohm. I'm not sure it is common phenomenon of register or multimeter.
2. A 7805 regulator sometimes became so hot. According to the Physical Computing page 4, it's getting too much electrical energy and I have a problem. (add) page 47, it's normal to get a little hot if it operating at the high end of its range.
3. In section 3, When I put three LEDs in serial, I could see the light while I made a darkroom with my two hands. But, it was so dim and only cases of red LEDs and yellow, not white or green.
4. Why we use a 5V for common circuit?
- To avoid noise and reduce electrical waste
5. Why we use 'I' for an electric Current?
- Because, C was occupied by Capacitance, and maybe there are three basic components; Capacitor, Resistance, Inductor
6. Students of Todd's class made somewhat different circuit, especially setting up 5 Volts. After I finished my assignments, I made circuit again following Todd's instructions. I successfully lighted LED up, but I don't know why we use 1uF and 10uF capacitor. In my guess, it manages an irregular voltage so that regulator and other components work better.
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