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Type: Posts; User: Swend

1. ## Thread: Ohm's Law and Power calculation problem

by Swend
Replies
27
Views
1,008

### Closed: Re: Ohm's Law and Power calculation problem

Yes, but in this data series, the current is never zero, otherwise the calculating script throws a divide by zero warning, which it doesn't in this case. - so no zeros.

As I have said several...
2. ## Thread: Ohm's Law and Power calculation problem

by Swend
Replies
27
Views
1,008

### Closed: Re: Ohm's Law and Power calculation problem

Yes that's how it's calculated.

Yes, I agree in the case of singular points, but 6.7e10 as in the plot is still finite.

And what if both U(t) AND I(t), as the case is here, are not...
3. ## Thread: Ohm's Law and Power calculation problem

by Swend
Replies
27
Views
1,008

### Closed: Re: Ohm's Law and Power calculation problem

As a service for the persons reading this post, I made the following calculations:

I took the first full pulse from the data file (SDS00001.CSV attached in previous thread) and it looks like this...
4. ## Thread: Energy doesn't FLOW the way you THINK! (Electrodynamics)

by Swend
Replies
2
Views
353

### Closed: Re: Energy doesn't FLOW the way you THINK! (Electrodynamics)

I agree the mathematics is definitely not trivial, that's why it even more impressive that Nick Lucid (the video channel owner) still manages to covey the essence of such complex math only by the use...
5. ## Thread: Ohm's Law and Power calculation problem

by Swend
Replies
27
Views
1,008

### Closed: Re: Ohm's Law and Power calculation problem

I had to make a new measurement to record the full pulse and a bit more. The only change I have made is the nominal value of "R" I lowered it from 1.1M to 883K which resulted in higher voltage and...
6. ## Thread: Energy doesn't FLOW the way you THINK! (Electrodynamics)

by Swend
Replies
2
Views
353

### Closed: Energy doesn't FLOW the way you THINK! (Electrodynamics)

Hi friends

It seems to me that fundamental electric theory is no longer taught in school, which is a shame as it results in everyone having their own intuition and interpretation about it, leading...
7. ## Thread: Ohm's Law and Power calculation problem

by Swend
Replies
27
Views
1,008

### Closed: Re: Ohm's Law and Power calculation problem

I don't appreciate your irony. Where do you find excess energy? The negative current goes back to the source's power supply, the power supply performs work (Work as in W = F * d * cosθ) on it at a...
8. ## Thread: Ohm's Law and Power calculation problem

by Swend
Replies
27
Views
1,008

### Closed: Re: Ohm's Law and Power calculation problem

In stead of expressing your personal distrust maybe you should start by posing me a question. Obviously the traces don't start "out of nothing" I just chose to start at that particular point when...
9. ## Thread: Ohm's Law and Power calculation problem

by Swend
Replies
27
Views
1,008

### Closed: Re: Ohm's Law and Power calculation problem

I would say at least one, but I am willing to entertain the possibility of two.

I vote in favor of that suggestion, I already spent \$1.000 on the CT, if the CT is yielding incorrect results I...
10. ## Thread: Ohm's Law and Power calculation problem

by Swend
Replies
27
Views
1,008

### Closed: Re: Ohm's Law and Power calculation problem

Hi Klaus

The simple and only reason I talk about R as an ohmic load is:
156367

I did not say it behaved like an ohmic load, because according to the measurements it definitely doesn't,...
11. ## Thread: Ohm's Law and Power calculation problem

by Swend
Replies
27
Views
1,008

### Closed: Re: Ohm's Law and Power calculation problem

Hi Klaus.

First let me make my intentions very clear:

What I have recorded is NOT the desired result, so I need to establish a baseline to move away from the current result. I need...
12. ## Thread: Ohm's Law and Power calculation problem

by Swend
Replies
27
Views
1,008

### Closed: Re: Ohm's Law and Power calculation problem

Hi Klaus

First I made a typo, I mixed the UI value up with IIR value, here are the corrected values.

(UI) P = -3.731 W
(UUR) P = 25W
(IIR) P = 809.471 W
13. ## Thread: Ohm's Law and Power calculation problem

by Swend
Replies
27
Views
1,008

### Closed: Ohm's Law and Power calculation problem

Hi friends,

I understand there are three ways of calculating power

(UI) P = U * I
(UUR) P = U² / R
(IIR) P = I² * R

When I measure voltage, current and resistance in my circuit,...
14. ## Thread: Transformer: current loss

by Swend
Replies
7
Views
436

### [SOLVED]Closed: Re: Transformer: current loss

Not luck, but fingerspitzengefühl and rubber tape ;-)

- - - Updated - - -

The left one aka "sucky-I" is the air-cored one. I measured the "inductance" of the primary (with the secondary...
15. ## Thread: Transformer: current loss

by Swend
Replies
7
Views
436

### [SOLVED]Closed: Re: Transformer: current loss

Klaus, I didn't say that I expected same power with same current. I said the voltage is stepped down by a factor of 10, but the current stays the same i.e. there is a ten fold power loss which...
16. ## Thread: Transformer: current loss

by Swend
Replies
7
Views
436

### [SOLVED]Closed: Transformer: current loss

Hi friends.

I have now two transformers which both suɔʞ at what they do, so I have named the left as "sucky-I" and the right as "sucky-II" (the black tape is self-vulcanizing rubber, excellent at...
17. ## Thread: Determine Transformer Loss

by Swend
Replies
6
Views
522

### Closed: Re: Determine Transformer Loss

I think I just have come up with a extremely bad design that is extremely lossy.

Thank you, And how about the way I calculate power i.e. can I calculate average power by summing the...
18. ## Thread: Determine Transformer Loss

by Swend
Replies
6
Views
522

### Closed: Re: Determine Transformer Loss

Hi arajur

Here is a picture of one. I use one to measure primary voltage and a second one to measure secondary voltage.
155132

This is exactly my point, it must be very inefficient,...
19. ## Thread: Determine Transformer Loss

by Swend
Replies
6
Views
522

### Closed: Re: Determine Transformer Loss

OK, I will try to rephrase my question.

Accorcing to electronics-tutorials.ws in a ordinary power-transformer with sine AC, the efficiency is
155109

And the power is calculated like this...
20. ## Thread: Determine Transformer Loss

by Swend
Replies
6
Views
522

### Closed: Determine Transformer Loss

Hi friends.

I would like to know the loss (power/energy) in a air-core pulse transformer of my own fabrication.

What we are looking at is this:
155096

I'm measuring voltage with two...
21. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
1,229

### Closed: Re: Bridge Rectifier won't Rectify

Yes that's what I did, but I wrote the opposite., sorry. And now I changed caps because the 1n blew up it was only 3KV. So I found some old USSR caps of 22p 12KV put those across the 100M, and a...
22. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
1,229

### Closed: Re: Bridge Rectifier won't Rectify

So I made a 100:1 with 100M+100n/1M+1n and it also works. I was actually using 100:1 until this voltage rise thing threw me off in the wrong direction. The top resistor is made of glass and the...
23. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
1,229

### Closed: Re: Bridge Rectifier won't Rectify

Well, I tried adding capacitance (ranging from 33p to 2.2n) across the 100M, and what I saw on the scope was that the full 6Vp-p from the signal generator appeared across the lower 100K resistor,...
24. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
1,051

### Closed: Re: Pulse transformer output measured vs. calculated?

I don't think there is one

155074

You only get the current after integration, see post #20
25. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
1,051

### Closed: Re: Pulse transformer output measured vs. calculated?

Whats the reasoning for that the ramp should not be there? The trace in post #20 is the integrated result, the raw di/dt output is as below scope trace and does not show any DC offset. Here is a...
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