electro-, electr-, electri-
(Greek > Latin: electric, electricity; from amber, resembling amber, generated from amber which when rubbed vigorously [as by friction], produced the effect of static electricity)
Electronics in our lives consists of numerous tools
Equipment which we use everyday relies on electronics to function including calculators, car controls, cameras, washing machines, medical scanners, mobile telephones, radar systems, computers; as well as many other applications or devices which are listed in this unit.
The statements of these four equations are as follows:
- Electric field diverges from electric charge.
- There are no isolated magnetic poles.
- Electric fields are produced by changing magnetic fields.
- Circulating magnetic fields are produced by changing electric fields and by electric currents.
Maxwell based his description of electromagnetic fields on these four statements.
It might be caused by the uncoupling of ventricular muscle contraction from electrical activity or it might be a result of cardiac damage with respiratory failure and cessation of cardiac venous return.
2. A device for measuring an electric charge by the movement of a vane suspended on a wire between metal quadrants.
The charge is introduced on the vane and quadrants in such a way that there is a proportional twist to the wire.
2. One of several oxidation-reduction electrode's in which the ratio of the two forms (quinone-quinhydrone), determined by the hydrogen ion concentration, sets up a potential that can be measured and converted to a pH value (fails above pH 8).
3. Quinhydrone electrode is a redox electrode (inert electrode; such as, platinum, gold, carbon) used for measuring pH (measure of the acidity/alkalinity of a solution).
An inert metal (usually platinum) is immersed into the solution to be analyzed and a small amount of quinhydrone crystals is added to the solution.
Quinhydrone is slightly soluble in water, dissolving to form a mixture of two substances, with each of the two substances easily oxidized or reduced to the other.
The potential at the inert electrode depends on the ratio of the concentrations of two substances, which, in turn, depends on the pH.
When used for recording, two electrodes must be used: the exploring electrode and the reference electrode.
The most common reference electrode is the silver electrode or silver chloride electrode.2. An electrode the placement of which is remote from the source of recorded activity, so that it is presumed to be at either a negligible or a constant potential.
2. An electrode; such as, the silver/silver chloride electrode in which the electrochemical reaction is reversible, which results in a low resistance to direct current.
An electrode reaction is considered reversible in the "electrochemical sense" if the reaction is fast, that is, if the exchange current density of the electrode reaction is large.
In contrast, in the "chemical sense", reversibility indicates that the reaction can proceed both in forward and backward (reverse) directions.
It is used in mapping ventricular arrhythmias.
It is used to asses ventricular activities and responses to stimuli.
Test substances are driven directly into the medium which contains the antibody, forming rocket-shaped (inverted V) trails of precipitation.2. Electrophoresis in which antigen migrates from a well through agar gel containing antiserum, forming cone-shaped (rocket) precipitin bands.
The area under the cone is used to calculate the amount of antigen.
The calomel (mercury compound) electrode has been the standard secondary reference electrode used in the laboratory since the introduction of the pH electrode.
This is the most common type used in electroencephalography.