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Resistivity
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High Quality Content by WIKIPEDIA articles! Electrical resistivity (also known as specific electrical resistance or volume resistivity) is a measure of how strongly a material opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electrical charge. The SI unit of electrical resistivity is the ohm metre ( m). The reason resistivity has the units of ohm-metres rather than the more intuitive ohm per metre ( /m) can perhaps best be seen by transposing the definition to make resistance the subject. The resistance of a given sample will increase with the length, but decrease with the cross sectional area. If one uses the common hydraulic analogy, pushing 5 gallons per minute through a garden hose would meet with some resistance. 5 gpm through a 4" diameter pipe would be relatively easy, requiring less pressure. Cross sectional area reduces resistance. Similarly, a 12 ft garden hose will fill a 5 gallon bucket in a certain amount of time. Filling the same bucket from the same spigot but with 500 feet of hose will fill the bucket in a significantly longer time. Length increases resistance.
Weitere Informationen
- Allgemeine Informationen
- GTIN 09786130319908
- Editor Lambert M. Surhone, Miriam T. Timpledon, Susan F. Marseken
- Sprache Englisch
- Genre Physik & Astronomie
- Größe H220mm x B150mm x T6mm
- Jahr 2009
- EAN 9786130319908
- Format Fachbuch
- ISBN 978-613-0-31990-8
- Titel Resistivity
- Untertitel Electric Current, Electric Charge, Ohm, Magnitude(mathematics), Volt, Ampere, Current Density, Electrical Conductivity, Hydraulic Analogy
- Gewicht 165g
- Herausgeber Betascript Publishers
- Anzahl Seiten 100
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