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| The Art of Electronics: Solutions to Exercises? |
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| rstofer:
--- Quote from: masterquiper on April 06, 2017, 09:31:01 am --- In this simpler case: Using 5V as Input (from arduino), adding a resistor of 150 Ohms and a single LED of 2V and 20mA. The resistor will use 0.16amps and the LED 0.02? This looks quite inefficient, or am I wrong? Really appreciate, Masterquiper --- End quote --- 5V source - 2V LED => 3V across the resistor. 20 mA forward current with 3V drop => 150 Ohm resistor and the current is the same in both the LED and resistor. The resistor is dissipating E^2 / R watts => 9/150 or 0.06 Watts. Every time you use a resistor, you are creating heat. By definition, this is inefficient. Unfortunately, this power loss is just a cost of doing electronics. We work to minimize it but we can not totally avoid it. |
| iainwhite:
--- Quote from: Nusa on April 06, 2017, 11:54:29 am ---I can't correct your math, since you didn't show it. No idea where you got 0.16 amps. --- End quote --- I believe he used the E^2/R equation from a prior post i.e. 5x5v / 150 Ohms = 0.1666 Amps for the resistor. Not saying that is correct - just my guess at the way it was worked out. |
| jensenr30:
I recently discovered this repository where people are writing solutions to exercises (in LaTeX!) for the 3rd edition of The Art of Electronics. https://github.com/milesdai/TAoE3Solutions The PDF has about 20 solutions so far. I've added a few that should be merged into master soon. Hopefully we can get more community involvement to speed up development of this collection of solutions. PDF direct link: https://github.com/milesdai/TAoE3Solutions/blob/master/Chapter1.pdf --- Quote from: Asmyldof on May 19, 2015, 10:16:23 pm ---I think I would be willing to contribute a little to some solutions and the like if the Wiki comes to life. Keep me informed about any help I can provide and I will see what I can do. --- End quote --- Here is your opportunity! |
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