Amperostat

Amperostat

An amperostat is a control and measuring device used to keep constant the current flowing though electrolytic cells in coulometric titrations, disregarding changes in the load itself. Synonym is "galvanostat". The amperostat respond to changes in the resistance of the cell by varying its output potential: as Ohm's law shows, :{R} = {U over I} the variable system resistance and the controlled voltage are directly proportional, i.e.: U_c ={R_v imes I_o}where
*"I_o" is the electrical current that is kept constant
*"U_c" is the output control voltage of the amperostat
*"R_v" is the electrical resistance that variesthus, 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 measure a wide range of currents (from picoamperes to amperes) of both polarities.

See also

*Current source.
*Galvanostat.
*Potentiostat.


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Coulometry — is the name given to a group of techniques in analytical chemistry that determine the amount of matter transformed during an electrolysis reaction by measuring the amount of electricity (in coulombs) consumed or produced.[1] There are two basic… …   Wikipedia

  • Galvanostat — A galvanostat is a control and measuring device capable to keep constant the current through an electrolytic cell in coulometric titrations, disregarding changes in the load itself. A synonym is amperostat . Its main feature is its nearly… …   Wikipedia

  • Cyclic voltammetry — Typical cyclic voltammogram where ipc and ipa show the peak cathodic and anodic current respectively for a reversible reaction. Cyclic voltammetry or CV is a type of potentiodynamic electrochemical measurement. In a cyclic voltammetry experiment… …   Wikipedia

  • Differential pulse voltammetry — (AKA Differential Pulse Polarography or DPP) is often used to make electrochemical measurements. It can be considered as a derivative of linear sweep voltammetry or staircase voltammetry, with a series of regular voltage pulses superimposed on… …   Wikipedia

  • Potentiostat — A potentiostat is a control and measuring device that, in an electrolytic cell, keeps the potential of the working electrode at a constant level with respect to the reference electrode. It consists of an electric circuit which controls the… …   Wikipedia

  • Potentiometer (measuring instrument) — A potentiometer is an instrument for measuring the potential (voltage) in a circuit. Before the introduction of the moving coil and digital volt meters, potentiometers were used in measuring voltage, hence the meter part of their name. The method …   Wikipedia

  • Chemotronics — is an intersection field of chemistry (especially electrochemistry) and electronics dealing with the design of electrochemical and optical chemical sensors[1]. One of pioneers of this field was Alexander Frumkin[2]. Notes ^ IEEE ^ *A Frumkin… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”