Electrostatics by Niels Jonassen (auth.)

By Niels Jonassen (auth.)

This booklet is the main complete remedy but of the issues confronted via the engineer as a result of static electrical energy. Written in as non-technical a way as attainable, given the intensity of the cloth, this booklet discusses the cloth from the newbie point to many complicated issues for engineers and architects. It discusses not just the damaging and destructive identified results of static electrical energy on electric and digital gear, however the attainable options and purposes that may be used to forestall it.

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As a result, electrons will flow to the metal with the highest work function where the electron energy is lowest. The transport of electrons stops when the energy levels (Fermi levels) have the same height in the two metals. The voltage difference between the metals is then equal to the difference in work functions divided by the electronic charge. , less than about 2-3 nm, even at just a single point. It should be mentioned here that charge separation caused by contact between metals only may produce normal static electric effects, when the separation of the metals involved is very fast, for instance if metal dust is blown against an isolated metal surface.

7, we find that when a dielectric in the region between two plates is partly replaced by a dielectric with a higher permittivity, 28 Chap. 2 Fundamental Concepts the maximum voltage between the plates will be lower, even if the new dielectric has a higher breakdown field strength. 10. Types of Discharges As we have explained, ionization will take place and charges will be moved if the field strength at a given point exceeds a critical value, the breakdown field strength, characteristic for the material in question.

This is called the contact potential difference, and for most metals it has a value ranging from a couple of tenths of a volt to a few volts. , the work required to remove a (loosely bound) electron (the work function) is different for the two metals. As a result, electrons will flow to the metal with the highest work function where the electron energy is lowest. The transport of electrons stops when the energy levels (Fermi levels) have the same height in the two metals. The voltage difference between the metals is then equal to the difference in work functions divided by the electronic charge.

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