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Electrical conduction is the movement of electrically charged particles through a transmission medium (electrical conductor). The movement of charge constitutes an electric current. The charge transport may be as a result of potential difference due to an electric field, or as a result of a concentration gradient in carrier density, that is, by diffusion. The physical parameters governing this transport depend upon the material. Conduction in metals and resistors is well described by Ohm's Law, which states that the current is proportional to the applied electric field. The ease with which current density (current per unit area) J appears in a material is measured by the conductivity σ, defined as:
or its reciprocal resistivity ρ:
Conduction in semiconductor devices may occur by a combination of electric field (drift) and diffusion. The current density is then: with q the elementary charge and n the electron density. The carriers move in the direction of decreasing concentration, so for electrons a positive current results for a positive density gradient. If the carriers are holes, replace electron density n by the negative of the hole density p. In linear anisotropic materials, σ, ρ and D are tensors. From Wikipedia under the
GNU Free Documentation License What is the electrical conduction for a 20 cent peice (Australian)? Q. I need this answer quick this assignment is due in 4 days so anyone please help!!! Asked by Asuka - Fri May 22 21:38:00 2009 - - 1 Answers - 0 Comments A. do you mean conductivity? or conductance? what is the geometry? face to face? one edge to the other edge? 20 cent piece is 28.52 mm in diameter, thickness is <2.5 mm, 75% copper, 25% nickel . Answered by billrussell42 - Fri May 22 22:18:31 2009 A Question on the Heart (Electrical Conductions System)? Q. Please Yahoo! peeps I need your help on this hard subject Bio! here's my question (essay format). I just don't know where to start on this essay I need a sense of direction and clarity on the subject! please bio majors enlighten me! Electrical Conductions System + Be able to explain in detail the conduction system of the heart - specific time frames are not necessary + Be able to explain the action potential involvement (potassium, sodium, and calcium) Asked by Vpow - Mon Nov 26 18:18:04 2007 - - 1 Answers - 0 Comments A. Ok so you should focus on how the atrium is the first part of the heart to contract which sends the blood to the ventricle and then the ventricle needs to contract to send the blood to the lungs or heart depending if we are in the left or right venticle. For conduction talk about the activation of the sinoatrial node which is responsible for the contraction of the atria. The wave of stimulation will eventually reach the atrioventricular node and it is delayed there prior to reaching the bundle of His or the Purkinje fibers- which will cause the ventricles to contract. You can also talk about the different intervals in an EKG/ECG know as the PQRST wave. As for involved of potassium, sodium and calcium- sodium influx is what causes… [cont.] Answered by bzim03 - Mon Nov 26 19:05:44 2007 This is the site of action for furosemide(lasix)?
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