How To Levitate Yourself
How To Levitate Yourself
How to read the numbers on a capacitor
A useful section would be an explanation of how to read the markings on a capacator. THanks.
There is no single source that I can find that explains what the labels on capacitors mean, for example my air conditioner capacitor states: 30/7.5mdf 370VA, I am left guessing. 71.127.24.125
Different types
Please include a dicussion on the different types of caps (electrolitic, ceramic, film, tantlum, etc) and their various strength and weaknesses. Dept of Alchemy 09:10, 12 January 2007 (UTC)
I don't understand!
You need to talk about the physics FIRST so it's easier to understand the beginning of it!!!
Pictures
I suggest moving the pictures to the capacitor (component) page as they are more appropriate there--Light current 15:00, 3 December 2005 (UTC)
TODO
I would suggest doing the following:
- Move capacitor non-idealities before the section describing types of capacitors. The former is needed to understand the latter.
- Remove the bit about replacing old electrolytics in audio equipment. Or possibly move this into the section on capacitor types
- Are the ESR numbers good? I've seen caps with much higher ESR. Someone should verify this.
- I'd clean up/organize the section on non-idealities. Parts of it are a bit rambling. I'd have one paragraph on each type of non-ideality, I'd also move the parts on accuracy/precision from the top into this section.
At some point, it'd be very nice to have a table of type of capacitor vs. accuracy, tempco, ESR, ESL, resonant frequency, leakage, etc. This would be a valuable resource.
I don't think it's bad to have more information in a Wikipedia article (as someone mentioned about keeping it basic/for beginners, rather than an engineering reference). But I do agree that the additional information should come in seperate sections at the end. A beginner should be able to read the first bit. An expert should be able to use the rest for reference. The reference should be in a reference format. We could add a section 'engineering practice' at the end for this. Organize it as:
Overview
Physics
History
Non-idealities
Types of capacitors
Applications/Engineering practics
Parrallel Plate Capacitor vs Other Geometries
I have the gut feeling that the equation C=Q/v works for point charges and infinitely long parallel surfaces - but that it isn't true for spherical or - more realistically - cylinderical capacitors. Am I right? Note of this should be on this page if I am. Fresheneesz 18:17, 20 November 2005 (UTC)
Fresheneesz: C=Q/V works for any capacitor. C is a geometrical factor that depends on the shape and size of your capacitor. Of course, you're right that infinitely close parallel plates and point charges are just an approximation. These don't affect the relationship C=Q/V, just the constant C itself. Jwyrwas 17:02, 31 January 2006 (UTC)
However, I would like to add something to the Physics: Capacitance section, that
, where a is the inner radius and b is the outer radius for a cylindrical capacitor, and
for a spherical capacitor. Jwyrwas 17:11, 31 January 2006 (UTC)
Synchronous Capacitor
One of the very important theories in Electrical engineering is regarding the use of motors in control systems. throughout the article, there is no mentioning about the servo motor exhibiting capacitance effect. note the point. --Davy Jones 08:15, 16 October 2005 (UTC)
Does a servo motor have a capacitor effect or are you thinking about angular momentum?--Light current 09:10, 16 October 2005 (UTC)
- As load on the motor increases, I a increases regardless of excitation .
- For under and over excited motors, the power factor (p.f.) tends to approach unity with increase in load.
- Both with under and over excitation, change in p.f.is greater than in I a with increase in load.
- With normal excitation, when load is increased, change in I a is greater than in p.f. which tends to become increasingly lagging.
- The magnitude of armature current varies with excitation. The current has large value both for low and high values of excitation (though it is lagging for low excitation and leading for higher excitation). In between, it has minimum value corresponding to a certain excitation. The variations of I with excitation are known as V curves because of their shape.
- For the same input, the armature current varies over a wide range and so causes the power factor also to vary accordingly. When over-excited, motor runs with leading power factor and with lagging power factor when under-excited. In between, the power factor is unity. The curve for power factor looks like inverted V curve. Also, the minimum armature current corresponds to unity power factor .
Well I think a motor is a motor and not a capacitor even tho it may have a leading PF. It should be included in the page on motors though! and definitely on the page about power factor correction. BTW Its an electrical device!--Light current 01:46, 23 October 2005 (UTC)
But there are a lot of well, standard books that refer them as servo capacitors' . We must consult some industrialist as they deal with larger capacitances. what do u think? --Davy Jones 01:56, 23 October 2005 (UTC)
I think the capacitor page is too big alrady! Put it in PFC power factor correction or motors or something :-)--Light current 01:59, 23 October 2005 (UTC)
I wouldn't call it a capacitor, per se. (i forgot about this thing) It will supply a leading reactance load as long as it is always synchronized to the lagging (inductive) load. If they become unsynchronized, it's not functionling like a capacitor. A capacitor is a capacitor is a capacitor all the time. Snafflekid 18:46, 23 October 2005 (UTC)
Category?
Why does Inductor belong to ] while Capacitor belongs to ]?--Astor Piazzolla 11:55, 14 December 2005 (UTC)
Missing definition
In the discussion of impedance Z you don't give a definition for j. If it's supposed to be obvious from the mention of "imaginary component" right below -- it's not.
Cleanup
This article is not clearly defined:
- As I understand, all the component-related stuff goes into Capacitor (component). But the physics is already present in capacitance, and shouldn't be duplicated here.
- The topic on safety hazards of capacitors used with tesla coils has, in my opinion, nothing to do in an article that is supposed to be the root of the Category:Capacitor (i.e the one with the broadest scope).
- The topic about tolerance values is available in much more details in Capacitor (component).
- The Application section should be categorized: Signal decoupling and tuned circuits are a subtopic of signal processing, as well as filtering the output of a rectifier is a subtopic of energy storage.
This is why I added the cleanup tag. What is your opinion about this? -- CyrilB 23:13, 8 April 2006 (UTC)
Well, I think it is appropriate, because I'd like to get some attention on that issue. As I can see, many people have worked on this article, and I don't want to start a revert war... I'll start some light modifications, but I really think this article must be clarified, as any person looking for information about capacitors on wikipedia will arrive on this page. In my opinion, this page must give an oversight of the Category:capacitor structure. And this requires heavy changes that I'd prefer to discuss first. -- CyrilB 09:57, 9 April 2006 (UTC)
(Sorry if I don't indent correctly, I thought I had to indent one step more than the paragraph I reply to) Actually, it took me some time to find the Capacitor (component) page, although there is a link on top of Capacitor. I was about to propose a merge, but it might be simpler to remove some stuff from this article first. I agree with the sections you propose, although I would reduce the circuit theory as much as possible, as there is already a page about parallel and series connections. Non-idealities are currently in the Capacitor (component) article, but I agree they should be moved here. This would result in this page being about capacitor theory and phenomena, and Capacitor (component) about technology. CyrilB 14:37, 9 April 2006 (UTC)
Photo captions
While the pictures at the top of the page are nice it would be good to say whther the rulers are graduated in inches or centimetres. I think they're both in inches but I'm not sure. Lisiate 01:56, 10 April 2006 (UTC)
Variable Capacitor Photos?
They're seen less and less in modern radio electronics, but some photos of variable capacitors common in radio receivers, transceivers, and antenna matching devices would be nice to see...
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