Saybolt universal second - Revision history

en>Dougweller: Reverted 1 edit by 24.171.168.89 (talk) to last revision by Jodosma. (TW)

2014-11-25T19:13:33Z

Reverted 1 edit by 24.171.168.89 (talk) to last revision by Jodosma. (TW)

← Older revision		Revision as of 21:13, 25 November 2014
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	A '''galvanostat''', (also known as '''amperostat''') is a [[control system\|control]] and [[measuring]] device capable of keeping the [[Electric current\|current]] through an [[electrolytic cell]] in [[coulometric]] [[titrations]] constant, disregarding changes in the load itself.		Greetings. The writer's name [http://www.videokeren.com/user/BFlockhar std home test] is Phebe and she [http://Www.cprogramming.com/tutorial/stl/stllist.html feels comfy] when people use the complete title. For years I've been operating as a payroll clerk. One of the extremely best issues in the world for him is to collect badges but he is struggling to discover time for it. Years in the past we moved to Puerto Rico and my family loves it.<br><br>my web-site: at home std at [http://www.animecontent.com/blog/461505 home std test] test - [http://exchange.craftemergency.org/thankyous/can-men-be-sexually-harassed-ladies visit the next site],

	~~Its main feature is its ''nearly'' "''infinite''" (i.e. extremely high respect to common loads) internal [[electrical resistance\|resistance]].~~

	The ~~designation "~~''galvanostat''" is mainly used in [[electrochemistry]]: this device differs from common [[current source\|constant current sources]] by its ability to supply ''and [[measurements\|measure]]'' a wide range of [~~[Electric current\|current]]s (from [[picoampere]]s to [[amperes]]) of [[Polarity (physics)\|both polarities]].~~

	~~The galvanostat responds to changes in the [[Electrical resistance\|resistance]] of the cell by varying its output potential~~: ~~as [[Ohm's law]] shows,~~
	~~:<math>{R} = {U \over I}<~~/~~math>~~
	~~the variable system resistance and the controlled [[voltage]] are [[Directly proportional#Definition\|directly proportional]], i~~.e.
	~~:<math> U_c ={R_v \times I_o}<~~/~~math>~~
	~~where~~
	*''<math>I_o</~~math>'' is the electric current that~~ is ~~kept constant~~
	*''<math>U_c</math>'' is the output control voltage of the amperostat
	*''<math>R_v</math>'' is the electrical resistance that varies;
	~~thus, an increase of the load resistance implies an increase of the voltage the amperostat applies to the load. This device differs from common constant-current sources by its ability to supply~~ and [~~[Measurement\|measure]] a wide range of currents (from [[picoampere]]s to [[ampere]]s) of both polarities~~

	~~== Technical realization ==~~

	~~The simpler galvanostat consists of a high-voltage source producing a constant voltage ''<math>U<~~/~~math>'' with a resistor ''<math>R_{x}<~~/~~math>'' connected in series: in order to force an almost constant current through a load, this resistor shall be much higher than the load resistor <math>R_{load}</math>~~. ~~As a matter of fact, the current ''<math>I<~~/~~math>'' through the load is given by~~

	~~:<math> I = \frac{U}{R_x + R_{load}} <~~/~~math>~~

	~~and if <math>R_x<~~/~~math>>><math>R_{load}</math>,~~ the ~~current ''<math>~~I~~</math>'' is approximately determined by ''<math>R_x</math>'~~' as ~~follows~~

	~~:<math>I \cong \frac{U}{R_x}</math>~~

	~~This simple realization requires rather high voltages (~100 V) to keep the load [[Electric current\|current]] constant with sufficient approximation for all practical purposes~~. ~~Therefore, more complex versions~~ of ~~galvanostats, using electronic amplifiers with [[Electronic feedback loops\|feedback]] and lower voltages, have been developed and produced. These instruments are capable to feed constant currents~~ in the ~~ranges from few [[picoampere]]s (pA)~~ to ~~several [[ampere]]s (A); typical construction~~ for ~~use~~ in the ~~lower range of feed currents uses [[operational amplifier]]s~~.

	~~== See also ==~~
	*[[Current source]]
	*[[Potentiostat]]

	~~== External links ==~~

	*Pierre R. Roberge (Webmaster) "''[http://www.~~corrosion-doctors~~.~~org~~/~~Instrumentation~~/~~galvanostat.htm Galvanostat~~]~~''", corrosion~~-~~doctors.org~~ [http://~~www~~.~~corrosion-doctors~~.org/~~Principles~~/~~Glossary.htm Electrochemistry Dictionary].~~

	~~[[Category:Electroanalytical chemistry devices]~~]

en>Addbot: Bot: Migrating 1 interwiki links, now provided by Wikidata on d:q844596

2013-04-15T01:39:51Z

Bot: Migrating 1 interwiki links, now provided by Wikidata on d:q844596

← Older revision		Revision as of 03:39, 15 April 2013
Line 1:		Line 1:
	~~Greetings~~. ~~Let me begin~~ by ~~telling you the author~~'s ~~title - Phebe~~. ~~Years~~ in the ~~past he at home std test moved to North Dakota~~ and ~~his family loves at~~ [~~http~~://~~apcbook.com.ng~~/~~index~~.~~php?do~~=/~~profile-446~~/~~info~~/ ~~home std test] it~~. ~~Hiring has been my occupation over~~ the ~~[http~~://~~Www.Mtnstopshiv.org~~/~~sites~~/~~default~~/~~files~~/~~attachments/Herpes%20Brochure_Body_High%20Res~~.~~pdf counter std~~] ~~test~~ for ~~some time but I~~'~~ve already utilized for an additional 1. What I adore doing is taking part in baseball but I haven~~'t [http://~~Www~~.~~sciencedaily~~.~~com/releases/2013~~/10/~~131030185930~~.htm ~~produced~~] ~~a dime with it~~.~~<br><br>My web blog:~~ [http://www.~~zavodpm~~.ru/~~blogs~~/~~ashelykeplerlkws/9653-valuable-guidance-successfully-treating-candida-albicans at home std testing~~] ([~~http~~:~~//essexsinglesnights.co.uk/groups/cures-for-any-candida-tips-to-use-now/ special info~~])		A '''galvanostat''', (also known as '''amperostat''') is a [[control system\|control]] and [[measuring]] device capable of keeping the [[Electric current\|current]] through an [[electrolytic cell]] in [[coulometric]] [[titrations]] constant, disregarding changes in the load itself.

			Its main feature is its ''nearly'' "''infinite''" (i.e. extremely high respect to common loads) internal [[electrical resistance\|resistance]].

			The designation "''galvanostat''" is mainly used in [[electrochemistry]]: this device differs from common [[current source\|constant current sources]] by its ability to supply ''and [[measurements\|measure]]'' a wide range of [[Electric current\|current]]s (from [[picoampere]]s to [[amperes]]) of [[Polarity (physics)\|both polarities]].

			The galvanostat responds to changes in the [[Electrical resistance\|resistance]] of the cell by varying its output potential: as [[Ohm's law]] shows,
			:<math>{R} = {U \over I}</math>
			the variable system resistance and the controlled [[voltage]] are [[Directly proportional#Definition\|directly proportional]], i.e.
			:<math> U_c ={R_v \times I_o}</math>
			where
			*''<math>I_o</math>'' is the electric current that is kept constant
			*''<math>U_c</math>'' is the output control voltage of the amperostat
			*''<math>R_v</math>'' is the electrical resistance that varies;
			thus, an increase of the load resistance implies an increase of the voltage the amperostat applies to the load. This device differs from common constant-current sources by its ability to supply and [[Measurement\|measure]] a wide range of currents (from [[picoampere]]s to [[ampere]]s) of both polarities

			== Technical realization ==

			The simpler galvanostat consists of a high-voltage source producing a constant voltage ''<math>U</math>'' with a resistor ''<math>R_{x}</math>'' connected in series: in order to force an almost constant current through a load, this resistor shall be much higher than the load resistor <math>R_{load}</math>. As a matter of fact, the current ''<math>I</math>'' through the load is given by

			:<math> I = \frac{U}{R_x + R_{load}} </math>

			and if <math>R_x</math>>><math>R_{load}</math>, the current ''<math>I</math>'' is approximately determined by ''<math>R_x</math>'' as follows

			:<math>I \cong \frac{U}{R_x}</math>

			This simple realization requires rather high voltages (~100 V) to keep the load [[Electric current\|current]] constant with sufficient approximation for all practical purposes. Therefore, more complex versions of galvanostats, using electronic amplifiers with [[Electronic feedback loops\|feedback]] and lower voltages, have been developed and produced. These instruments are capable to feed constant currents in the ranges from few [[picoampere]]s (pA) to several [[ampere]]s (A); typical construction for use in the lower range of feed currents uses [[operational amplifier]]s.

			== See also ==
			*[[Current source]]
			*[[Potentiostat]]

			== External links ==

			*Pierre R. Roberge (Webmaster) "''[http://www.corrosion-doctors.org/Instrumentation/galvanostat.htm Galvanostat]''", corrosion-doctors.org [http://www.corrosion-doctors.org/Principles/Glossary.htm Electrochemistry Dictionary].

			[[Category:Electroanalytical chemistry devices]]

en>EmausBot: r2.7.3) (Robot: Adding tr:Saybolt evrensel birimi

2012-08-14T04:22:39Z

r2.7.3) (Robot: Adding tr:Saybolt evrensel birimi

New page

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