Talk:Voltage source

message: I reverted your edit to voltage source.  The power in a resistor driven by a voltage source is V2/R.  As R approaches 0, P approaches infinity. - Omegatron 19:10, August 3, 2005 (UTC)
:If the power is infinite, where is it dissipated?? (Not in the resistor: that is zero and P=I^2*R)
:Also, when shorted, the output voltage is zero, so V^2/R=0 doesnt it?? or does it?
:What is 0/0 these days??Light current 19:19, 3 August 2005 (UTC)
replies: text:  Having pondered this question over a few pints of fizzy coloured liquid, I now see that we are BOTH RIGHT and BOTH WRONG at the same time. I'm afraid that we have both fallen into the trap of considering the paradox of the Irresitible Force against the Immovable Object. Neither can win. Neither of us can win. What we need here is a compromise solution that is satisfactory to everyone. I think the clue lies in your statement that both an ideal voltage source AND a perfect short circuit cannot exist. In fact I believe that neither can exist. Hence, we are conducting a sterile argument. I think that the way out of this is to say that an ideal voltage source (or current source for that matter) cannot exist so it is pointless talking abut what happens when they are open or short circuited. We must remove the reference to ideal voltage or current sources that involve calculations of load power from the definitions of voltage source and current source. Is this acceptable to you??:)Light current 22:52, 3 August 2005 (UTC)
thread_title:  Infinite power during short circuit? 

message: This is the most familiar form of AC voltage source known to the Western world. Generally its output impedance is very low (much less than one ohm).
Mains electricity is a source of electrical power (voltage & current). But I think this article deals with voltage sources used within (and in the context of) electronic circuits. So IMHO, mains electricity should not be included in this article (as also cell or battery). These could be included under perhaps a "sources of electrical power" article.
In addition, what is the relevance of "the western world" here?? Rohitbd 20:30, August 6, 2005 (UTC)
:IT may not be the most familiar source of AC to some people living in under developed parts of the world such as Africa, India, China etc. etc but I did not want to say 'civilsed' world as that may be offensive to some.Light current 20:42, 6 August 2005 (UTC)
thread_title:  Mains Electricity 

message: A capacitor (esp large ones)can act and be considered as a voltage source. Especially the super capacitors whic act more like batteries (cells). By duality it is evident that an inductor also can act as a current source ( not ideal- but hey what is??)Comments please to my talk or here Light current 16:08, 8 August 2005 (UTC)
thread_title:  Capacitor as voltage source 

message: What would happen if two voltage sources are connected in parallel? The use of superposition theorem indicates that the output voltage across the paralel combination would be zero. But how does it happen? What is the physical reason behind such a behaviour?
:You can't use the superposition theorem for this case. The theorem requires you to replace each source in turn with a short circuit, which is impossible since you would be shorting out the opposite source, which is a fictional component with zero impedance. Since in this case you can't physically do what the theorem requires you to do, it won't give you a meaningful answer.  In reality, two equal voltage sources in parallel would look exactly like one source on its own, and two unequal voltage sources in parallel would add up to a puddle of molten copper. --Heron 20:11, 29 January 2006 (UTC)
replies: text: When two perfect voltage sources are paralelled. the superposition theorem DOES NOT indicate the voltage would be zero, it leads to an irresistable force/immovable object type problem! ofc this is not a problem in real cuircuit design as neither the iresistable force (perfect voltage source) or immovable object (zero resistance connection) can exist in practice. Plugwash 05:11, 3 February 2006 (UTC)
replies: text: Superposition cannot be applied for ideal sources. For two equal (ideal or non-ideal) sources, the current flow between the sources will be zero. For unequal sources, a current limited by the internal resistancs will flow till the voltages equalise to that of the lesser source's level. If the internal resistances are zero (i.e. in ideal case), theoretically there will (or should) be melt-down (infinite current). Rohitbd 17:56, 5 March 2006 (UTC)
thread_title:  Two voltage sources connected in parallel 

message: I think this page should have a section on how voltage sources can be combined. For example, sources in series can be added together. What I'm not sure about is how or if one can combine voltages sources that are in parallel and in series with elements (like source V1 in series with R1, and those two in parallel with V2 and R2). 68.6.112.70 06:06, 26 May 2006 (UTC)
thread_title:  Combinations and simplifications

message: (see also Current and Voltage Source Suggestion)
Hi everybody! Two monhts ago, I placed a link on constant current source page pointing to my story about this subject. In this way, I tried to resume the discussion about constant current source and the dual voltage source. Browsing through these and talk pages I found a lot of brilliant thoughts. Only, the pages look quite cluttered; there isn't good structure and hierarchy in their arrangements. So, I suggest rearranging the materials according to the principles below: 
1. At every page, expound the subject step-by-step by moving from simple to complex (imperfect to perfect, passive to active, transistor- to op-amp versions etc.)
2. At every step, first reveal the basic circuit idea; then show the concrete circuit solution.
In order to illustrate my suggestion, I have made a web page containing two versions of the contents - a short and a long one. Here is the short version:
:::Current Source
1. Theoretical current source.
1.1. Ideal current source: definition, examples of natural current sources.
1.2. Comparison between current and voltage sources.
1.3. Real current source: imperfections.
2. Practical current sources.
2.1. Ohmic resistor current source. Imperfections.
2.2. Dynamic resistor current sources.
2.3. Current sources with compensating voltage.
2.4. Current sources with compensating current.
2.5. Current sources using negative feedback.
:::Voltage Source
1. Theoretical voltage source.
1.1. Ideal voltage source: definition, examples of natural voltage sources.
1.2. Comparison between voltage and current sources.
1.3. Real voltage source: imperfections.
2. Practical voltage sources.
2.1. Voltage divider source. Imperfections.
2.2. Dynamic resistor voltage sources.
2.3. Voltage sources with compensating negative resistance.
2.4. Voltage sources using negative feedback.
I realize that I have proposed major changes in the structure of these pages. So, I would like first to coordinate them with you, especially with those who are created these pages; then, I will try to modify gradually (in small steps) the pages. But yet, don't remember that I am a Wiki newbie; so, don't bite me desperately:) --Circuit-fantasist 07:05, 30 June 2006 (UTC)
thread_title:  New structure 

message: This article does not make pedagogic sense.  It starts OK, but skips over the simple resistor voltage divider, and so does not explain the key concepts of line and load regulation. (Poor regulation is the best context for explaining the concepts, giving equations, and then being able to show how/why the better circuits are better.)  So, the LED/zener sections will not make much sense to readers unless they already understand the subject.
Arguing over whether a resistor voltage divider is "really" a voltage source is beside the point (let's tiptoe right past the point that real circuit designers use it as a handy voltage source all the time) -- it is the base core concept that all better secondary linear voltage sources are derived from.
-69.87.204.197 12:40, 28 May 2007 (UTC)
replies: text: This is an article about voltage sources, not  voltage regulators where line and load regulation belong.  Further, a resistor voltage divider is not a voltage source.  For there to be voltages across the resistors in the divider, there must be a source attached.  But, connecting a voltage source to a resistor divider and then calling that a voltage source seems silly.  With a current source, only one resistor is needed to make a voltage source.  Alfred Centauri 16:02, 28 May 2007 (UTC)
thread_title:  resistor voltage divider 

message: I've had a look round and found various pages online which could be added as sources. If no-one has any objections I'll put them in but not remove the 'no sources' template yet:
* 'circuit components and quantities' at Grand Valley State University introduces the voltage source symbol
* The 'circuit' entry from the McGraw-Hill Science/Technology Encyclopedia also gives this symbol and explains basic concepts, online here
* Zener diode voltage sources from allaboutcircuits; also a nice first-principles introduction to voltage and current which is relevant to the current source/voltage source discussion.
Dan TV 11:38, 6 June 2007 (UTC)
replies: text: I would like to add Paul Horowitz and Winfield Hill (1989), The Art of Electronics , Second Edition,  --Ancheta Wis 11:01, 22 August 2007 (UTC)
thread_title:  Sources 

message: Who would consider these things voltage sources?  What is this article really about? — Omegatron 18:38, 23 September 2007 (UTC)
thread_title:  Voltage dividers, capacitors, and mains? 

message: A "voltage source" is a concept in circuit analysis.  You don't "build" voltage sources in the real world, you build power supplies, batteries, or voltage references. You model real-world sources of electrical energy as "voltage sources" with various combinations of (possibly non-linear, possibly time-varying) impedances connected. --Wtshymanski (talk) 16:17, 5 November 2010 (UTC)
thread_title: Back to roots

message: Rubber diode redirects to voltage source, yet the phrase "rubber diode" appears nowhere in the article and there is no mention of the rubber diode, a.k.a. VBE multiplier. (IMO, this would be more appropriate in the Voltage reference article. --Theodore Kloba (talk) 11:30, 11 August 2015 (UTC)
replies: text: I decided to remove the redirect and create a new stub for Rubber diode. --Theodore Kloba (talk) 18:57, 11 August 2015 (UTC)
thread_title:  Rubber diode redirect? 

message: I dont think that an RC circuit can be properly called a voltage divider as its opartion depends on ac of a certain frequency. I intend to remove the RC network unless there are convincing arguments to keep it.86.187.170.222 (talk) 22:33, 15 December 2016 (UTC)
thread_title: RC circuit