what is a circuit? a beginner friendly intro!

[@Ricatellez682]

great book ... I shall read this book ? ofcourse yeahh

[@jamesmiddleton8128]

I

[@titactaco]

That was fun, I didn't know the history of the breadboard, that was cool. Your hair is incredibly pretty.

[@JenFoxBot]

oh yay! so glad you enjoyed that 😄 and thank you!

[@igorzherebiatev5751]

Nice demonstration of voltage dropping depends on colour. ) Red led has the smallest number about 1.7 V, White has the biggest- close to 3 V. CR 2032 you used isn't a great source of power. So it is just not enough to lit all the leds at the same time.

[@williamschacht]

Seems really interesting. Wish I had the time. I'm absolutely clueless as the why the red, yellow, and green lights cause the other colors to turn off etc.

[@JenFoxBot]

@@williamschacht I'll give you a hint: electricity is lazy! The colors are important here, it would help to take a look at a diagram of the electromagnetic spectrum 🙃

[@williamschacht]

@@JenFoxBot I'm familiar with the spectrum. Each color of light has a specific frequency within the visible range. But I know nothing about electronic circuits. Although I was briefly exposed to bread-boarding once upon a time in a class, but can't remember anything about it. Could it by any chance have something to do with more voltage being drawn from the circuit?

[@djt6fan]

Hey, I am an about to enroll into a master’s degree of mechanical engineering, but one thing has been bothering me for the longest time, and I was hoping you could answer my question, which is about infinitesimals. I understand infinitesimals as really small values, that cannot be expressed mathematically, since it’s a concept. I have also read that physicists and engineers misuse this notation. Intuitively it makes sense to lets say, chop up a charged rod into many small pieces, to get the electric effect each individual part of the rod has on some arbitrary point P located at some distance away from the rod, and then sum these individual contributions dE to get an electric field at this point P. I have used this scenario as an example illustrating how physicists use the differential notation to represent arbitrarily small quantities. My question is, many claim that their notation usage lacks rigor, or that they are skipping steps to arrive at a solution. I have been confused by how this notation has been used when I began my studies, but have grown accustomed to it. What I would like to know though is, what is actually behind this notation usage? My best guess is, they are treated as either really small numbers (not actual infinitesimals), or they are supposed to represent Δ or δ (which again are finite values), but the notation d[] implies that a limit to zero will be taken? Long-story short: what is meant by differentials (which lack a rigorous definition in standard analysis as standalone entities) when they are used by physicists or engineers? (is it just how Leibnitz would have used it back in the day, or is there more behind it?) I really hope you find some time to answer this, I have been searching for a proper answer for a long, long time 😃

[@JenFoxBot]

that's awesome you're starting a master's program, woo!! and love the Q on infinitesimals, I have a whole video on them here: kzbin.info/www/bejne/bYCYnnhnh5xjd5Y we can, and do, express infinitesimals mathematically: e.g. dx or 0 < x < 1/n. And also, I agree that we can't really represent infinitesimals as physical objects, just like we cannot represent infinity as a physical object. If I'm understanding your Q re: notation correctly, I would say it's less about rigor and skipping steps and more about context and preference. Physicists and engineers often use different notation for the same math operations, but they mean the same thing and there's no difference in rigor. Differentials in physics are the same as differentials in engineering (just like "torque" in physics is the same as "moment" in engineering -- and that took me way to long to figure out 😂). I've had calculus taught using both infinitesimals and limits - both are numbers/concepts that exist mathematically, but they exist in different spaces (infinitesimals are not part of the standard Real number system, whereas limits can be calculated using standard real numbers). And also, often when we are doing things like taking derivatives or using integrals, we're usually skipping steps (e.g. using findings of other folks who came before us). i hope that helps! Notation and labels can be confusing.

[@david_pilling]

I thought circuit would end up with you doing a lap of a running track - circuit meaning ending up where you started from. Connecting up a light is a great way to start learning.

[@JenFoxBot]

@@david_pilling hah!! Running in a circle is a great analogy!! I may snag that from you 😄