Recent content by sarumonkee

I'm open to donations :) I thought about the carbon track, but I have no way of making it very regular. I was thinking of just writing with a graphite pencil on some transfer paper, but don't think that would come out very well.

So in Lewin's setup, is he measuring the extra EMF across the resistors? I won't be able to do more tests until probably this weekend.

Do the extra EMF and induced EMF equal each other in this picture?

Nope... please enlighten me. I thought we were under the consensus that there is inductance in the line, Lewin did not have it in his model, and so KVL did work. Are you saying there is no voltage drop across the wires connecting the resistors? Where are my statements contradictory? I...

So after all these pages, and many words, I think I finally realize that we all might be saying the same thing. (Well most of us, some people that didn't stick around past page 4 said some pretty weird things). Basically, my problem with Lewin's example was he didn't account for the...

Sorry I didn't quote properly. That was a response to Hikaru's post #110 where s/he said: "Besides, since the wire's inductance is negligible, the 1-volt emf is mostly distributed on the 2 resistors (not evenly distributed over the whole loop). I don't really understand what to be in dispute...

The wire's inductance is not negligible... It is what allows the energy to be coupled into the circuit. That's why Lewin has such a huge coil and says it "BLASTS" flux everywhere. Yeah, the inductance is small, but with enough energy, Lewin is coupling the needed energy to get the currents he...

I don't get your comment. You say if the model is changed to include an element that affects the circuit, you get the right answer. If the model ignores the "lumped element" that is the voltage source (or inductor), then it is not wrong? How can you justify ignoring the effect of the very...

In my studies, the secondary resistance is modeled as a series resistance with the secondary inductance. It is the inductance that allows the energy transfer in a transformer, and is modeled as a voltage source when fed from the primary. I don't see a KVL error here. Source: Fundamentals...

Just to clarify, with my experimental setup, I was not getting a full 0.1V and 0.9V on the resistors. I don't think I have a large enough primary coil (read needs more turns), and I only did a 10V step, which was well away from the max current I could put through the thing. It was a quick...

No, I just realized I need to show that one as well... I will next time I'm back in that lab. The time I got 1:9 ratio is when I had the probe leads as close as possible to the resistors, and the grounds on the short side (1 cm wire connection). The probe leads were separated by the 6" wire...

I made my setup similar to what I think he did, except I made one connection from the 100Ω to 900Ω resistors very short. I then put ground of both probes between the two resistors on the short connection. The other sides of the resistors were connected with a 6" wire. I probed the resistors...

So you are saying pointing the "loop" of the voltage probe at a certain angle, I will get 0 Volts? I actually rigged up this experiment, and sufficiently convinced myself that KVL is holding... I held the probes above, below, across, etc, and got the same numbers time and time again. I am...

So after all that lead in, you don't answer my question about the scope above the table :)? If you know the answer, please tell me... Or at least hint at the direction I should look (but I think just hinting will make it look like you don't know the answer). I still don't get what you mean...

@Claude: I totally agree with your example. Thank you for agreeing with Yungman and myself. A standard model of the secondary of a transformer with sufficient frequencies being put through it (not too high, not too low) is a voltage source (or current source depending on your take on things)...