Talk:Dimmer

From Wikipedia, the free encyclopedia

	Film Portal This article is within the scope of WikiProject Films. This project is a central gathering of editors working to build comprehensive and detailed articles for film topics on Wikipedia. If you would like to participate, you can edit the article attached to this page, or visit the project page, where you can join the project and/or contribute to the discussion.
B This article has been rated as B-Class on the quality scale. ??? This article has not yet received a rating on the priority scale.
Editing Guidelines Please remember these guidelines when editing a film article: If a non-film article already exists with the name of the film that you are trying to create an article for, disambiguate and use (film) in the title: Film Title (film) For more information see: Wikipedia:Naming conventions (films) When writing an article about a particular film, the general format should be a concise lead section, followed by a plot summary of no more than 900 words, production details, a cast list, a reception section, and references. Create an Infobox that tells all pertinent information about the film.
Additional Information: This article has been checked against the following criteria for B-Class status: Referencing and citation: not checked Coverage and accuracy: not checked Structure: not checked Grammar: not checked Supporting materials: not checked To fill out this checklist, please add the following to the template call: <!-- 1. It is suitably referenced, and all major points are appropriately cited. --> |B-Class-1=yes/no <!-- 2. It reasonably covers the topic, and does not contain major omissions or inaccuracies. --> |B-Class-2=yes/no <!-- 3. It has a defined structure, including a lead section and one or more sections of content. --> |B-Class-3=yes/no <!-- 4. It is free from major grammatical errors. --> |B-Class-4=yes/no <!-- 5. It contains appropriate supporting materials, such as an infobox, images, or diagrams. --> |B-Class-5=yes/no Related task forces (general): Filmmaking task force

	This article is part of Wikipedia's Stagecraft coverage, and has come to the attention of WikiProject Stagecraft, an attempt to create a comprehensive and detailed resource on the art of stagecraft on Wikipedia. If you would like to participate in the project, you can choose to edit the article attached to this page (just like any other article!), or visit WikiProject Stagecraft, where you can join the project and see a list of open tasks.
B	This article has been rated as b-Class on the quality scale. (If you rated the article please give a short summary at comments to explain the ratings and/or to identify the strengths and weaknesses.)
???	This article has not yet received a rating on the importance scale.

Contents 1 Proof a rehostat will be dissipating 25% of the loads rating at maximum 2 Rheostat dimmer? 3 Something in ?Spainish? 4 Mistake 5 Efficiency

[edit] Proof a rehostat will be dissipating 25% of the loads rating at maximum

(i think the statement above is right but i need to go through the proof to convince myself before i add it)

find turning point to find point of maximum power

P_dimmer = V_dimmerI

R_dimmer + R_load = 2R_load

R_dimmer = R_load

therefore both loads are running at half the supply voltage therefore the load is running at 25% of its rated power and the rehostat is also running at 25% of the loads rated power.

The equations don't exactly hold for real-world incandescent light bulbs, though, because the tungsten filament radically changes its electrical resistance as it heats (over a sometime 10:1 ratio!).

Atlant 12:55, 29 January 2007 (UTC)

[edit] Rheostat dimmer?

That alleged "rheostat dimmer" in the photograph looks a lot more like a motor-driven, two pole variable autotransformer dimmer to me. Those windings look like copper, not nichrome.

Atlant 17:54, 7 August 2006 (UTC)

Sorry, I was always told by my teacher that this was a rheostat, but I guess he could be wrong. I believe the image could still be used somewhere in this article. JWGreen 00:48, 8 August 2006 (UTC)

Oh, no problem with using the image -- it's perfectly valid for what we're trying to illustrate. I was just quibling about the nomenclature. I just looked at the high-resolution version of the image and there's no doubt that those are autotransformers; thanks for making the change in the article!

Atlant 13:52, 8 August 2006 (UTC)

Variable autotransformers are generally known as variacs.

Rheostat dimmers which looked somewhat similar may have been used a _very_ long time ago. Tabby 22:33, 15 September 2007 (UTC)

[edit] Something in ?Spainish?

I removed the following from the start of the article. I don't think it's relevant, and even if it is, it's in the wrong language: "HOLA SOY PAPAS NATAS DE ELCTRONICA 2006 "4 AÑO c" Bryson430 13:01, 23 August 2006 (UTC)

Iknow a small amout of spanish, it means word for for word literaly "Hello this is potatoes notes of electronics" KeepOnTruckin 21:36, 29 January 2007 (UTC)

[edit] Mistake

There is a mistake on the dimmer's schematic. I build it and you have to add a 20k resistor between the scr's gate and the negative to stop the sinking current from the zener diode. —The preceding unsigned comment was added by 24.37.33.106 (talk • contribs).

It would depend on how electrically leaky your zener diode is versus how easily-triggered your SCR is.

Atlant 12:59, 29 January 2007 (UTC)

[edit] Efficiency

Article might benefit from an explanation of the effect of dimmers on lighting energy efficiency, or efficacy. I'll add a link to an article that explains this and more Tabby 01:42, 30 March 2007 (UTC)