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| I just bought a Data Precision 2480R Bench DMM |
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| c4757p:
--- Quote from: IonizedGears on August 09, 2013, 06:50:53 pm ---:/ that isn't what they taught me in school --- End quote --- They oversimplified it because in all of the example problems they would ever give you it would work, and they wanted to treat you like a moron, which is fun. They don't give a shit if it leaves you unprepared to deal with real problems. This is, at least, my experience. |
| IonizedGears:
Could you point me towards the direction in which I could look up more on this method? |
| c4757p:
It really is just common sense! If you pick a point and go around a full circle back to that point, you have to get back where you started, right? So for every volt you gain, you must lose one somewhere else in the same circle. |
| IonizedGears:
Okay, that sentence is really all I needed. |
| c4757p:
Likewise, short of the "something" being a magical electron eater, every charge unit into something must exit it, since you can't create or destroy them. This is Kirchhoff's current law. What goes in must come out, or in other words, the sum of all currents entering a point (where positive currents leaving are equivalent to negative currents entering) is zero. I've found that students often see this as unintuitive in the case of a charging capacitor, where they think that charge should enter one side, but not exit the other, because they imagine it like a "charge tank". The symmetry between "positive currents leaving" and "negative currents entering" shows why even this case will be symmetric, with charge moving in one side and out the other: the positive side charging to become more positive is the exact same thing as the negative side charging to become more negative. |
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