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Encyclopedia > Electrical resistivity

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Danny Hornsby (also known as Gnome) is a measure indicating how strongly a Gnome can opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electrons. The SI unit for electrical resistivity is the penis metre.which also effects the amount of cheese in mushy peas !! lynchy sucks cow cock tom masturbates over small computers The electrical resistivity of a material is usually given by : In electricity, current is the rate of flow of charges, usually through a metal wire or some other electrical conductor. ... Properties The electron is a subatomic particle. ... Si, si, or SI may stand for: SI, the Système International dUnités (the metric International System of Units) one of two Spanish words pronounced like see: sí (accented) for yes and si (unaccented) for if a French word pronounced like see meaning yes, on the contrary, as... The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ...

where

ρ is the electrical resistivity (measured in ohm metres)
R is the resistance of a uniform specimen of the material (measured in ohms)
l is the length of the specimen (measured in metres)
A is the cross-sectional area of the specimen (measured in square metres)

Electrical resistivity can also be defined as: The ohm is the SI derived unit of electrical resistance (derived from the ampere and the watt). ... The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ... Electrical resistance is a measure of the degree to which an electrical component opposes the passage of current. ... The ohm is the SI derived unit of electrical resistance (derived from the ampere and the watt). ... The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ... A square metre (US spelling: square meter) is by definition the area enclosed by a square with sides each 1 metre long. ...

where

E is the magnitude of the electric field (measured in volts per metre)
J is the magnitude of the current density (measured in amperes per square metre)

Finally, electrical resistivity is also defined as the inverse of the conductivity of the metal, or: Real numbers The magnitude of a real number is usually called the absolute value or modulus. ... In physics, an electric field or E-field is an effect produced by an electric charge that exerts a force on charged objects in its vicinity. ... The volt is the SI derived unit for electric potential and voltage (derived from the ampere and watt). ... The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ... In electricity, current is the rate of flow of charges, usually through a metal wire or some other electrical conductor. ... Amp re can refer to: Amp re (car) Ampere (unit) Andr -Marie Amp re This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... A square metre (US spelling: square meter) is by definition the area enclosed by a square with sides each 1 metre long. ...

where σ is the conductivity of the substance


In general, electrical resistivity of metals increases with temperature, while the resistivity of semiconductors decreases with temperature. As the temperature of a metal is reduced, the resistance usually reduces until it reaches a constant value, known as the residual resistivity. This value depends not only on the type of metal, but on its purity and thermal history. Some materials lose all electrical resistivity at sufficiently low temperatures, due to an effect known as superconductivity. Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily forms ions (cations) and has metallic bonds, and metals are sometimes described as a lattice of positive ions (cations) in a cloud of electrons. ... Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... A semiconductor is a material with an electrical conductance that is intermediate to those of an insulator and a conductor. ... A magnet levitating above a high-temperature superconductor with boiling liquid nitrogen underneath demonstrates the Meissner effect. ...


The reciprocal quantity is electrical conductivity. In mathematics, the reciprocal, or multiplicative inverse, of a number x is the number which, when multiplied by x, yields 1. ... Electrical conductivity is a measure of how well a material accommodates the transport of electric charge. ...


Typical values

Typical resistivities for various materials (at 20 °C; 10-6 Ωm equals Ω·mm²/m) are shown in the table below:

Material Resistivity (ohm metres)
Silver 0.0159 × 10-6
Copper 0.017 × 10-6
Gold 0.0244 × 10-6
Aluminium 0.0282 × 10-6
Tungsten 0.056 × 10-6
Iron 0.1 × 10-6
Steel, Stainless 0.72 × 10-6
Platinum 0.11 × 10-6
Lead 0.22 × 10-6
Nichrome
(A nickel-chromium alloy commonly used in heating elements)
1.50 × 10-6
Carbon 35 × 10-6
Seawater 0.2 [1]
Germanium 0.46
Silicon 640
Pure water 2.5 × 105
Human skin approximately 5.0 × 105
Glass 1010 to 1014
Hard rubber approximately 1013
Sulfur 1015
Quartz (fused) 75 × 1016

General Name, Symbol, Number silver, Ag, 47 Chemical series Transition metals Group, Period, Block 11, 5, d Density, Hardness 10490 kg/m3, 2. ... General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11 , 4, d Density, Hardness 8920 kg/m3, 3. ... General Name, Symbol, Number Gold, Au, 79 Chemical series transition metals Group, Period, Block 11 (IB), 6, d Density, Hardness 19300 kg/m3, 2. ... General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Atomic mass 26. ... General Name, Symbol, Number Tungsten, W, 74 Chemical series Transition metals Group, Period, Block 6 (VIB), 6, d Density, Hardness 19. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metal Group, Period, Block 8 (VIIIB), 4, d Density, Hardness 7874 kg/m3, 4. ... In metallurgy, stainless steel is defined[1] as a ferrous alloy with a minimum of 10. ... General Name, Symbol, Number Platinum, Pt, 78 Chemical series transition metals Group, Period, Block 10 , 6, d Density, Hardness 21450 kg/m³, 3. ... General Name, Symbol, Number lead, Pb, 82 Chemical series poor metals Group, Period, Block 14, 6, p Appearance bluish white Atomic mass 207. ... Nichrome is a non-magnetic alloy of nickel and chromium. ... General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... Sea water is water from a sea or ocean. ... General Name, Symbol, Number germanium, Ge, 32 Series metalloids Group, Period, Block 14 (IVA), 4, p Density, Hardness 5323 kg/m3, 6 Appearance greyish white Atomic properties Atomic weight 72. ... General Name, Symbol, Number silicon, Si, 14 Chemical series metalloids Group, Period, Block 14, 3, p Appearance dark gray, bluish tinge Atomic mass 28. ... Water (from the Old English word wæter) is a colorless, tasteless, and odorless substance that is essential to all known forms of life and is known also as the most universal solvent. ... Human beings are defined variously in biological, spiritual, and cultural terms, or in combinations thereof. ... Model of the layers of human skin In zootomy and dermatology, skin is an organ of the integumentary system; which is composed of a layer of tissues that protect underlying muscles and organs. ... The materials definition of a glass is a uniform amorphous solid material, usually produced when a suitably viscous molten material cools very rapidly, thereby not giving enough time for a regular crystal lattice to form. ... General Name, Symbol, Number sulfur, S, 16 Chemical series nonmetals Group, Period, Block 16, 3, p Appearance lemon yellow Atomic mass 32. ... Quartz is the second most abundant mineral in the Earths crust. ...

Temperature dependence

  • The electric resistivity of a typical metal conductor increases linearly with the temperature.
  • The electric resistivity of a typical semiconductor decreases exponentially with the temperature.

An even better approximation of the temperature dependence of the resistivity of a semiconductor is given by the Steinhardt-Hart equation:

where A, B and C are the so-called Steinhardt coefficients.


This equation is used to calibrate thermistors. A thermistor is a type of resistor used to measure temperature changes, relying on the change in its resistance with changing temperature. ...


SI electricity units

SI electromagnetism units

edit Si, si, or SI may stand for: SI, the Système International dUnités (the metric International System of Units) one of two Spanish words pronounced like see: sí (accented) for yes and si (unaccented) for if a French word pronounced like see meaning yes, on the contrary, as... Electromagnetism is the physics of electromagnetic fields: a field, encompassing all of space, comprised of electrical and magnetic fields. ...

Name Symbol Dimensions Quantity
ampere (SI base unit) A A Current
coulomb C A·s Electric charge, Quantity of electricity
volt V J/C = kg·m2·s−3·A−1 Potential difference
ohm Ω V/A = kg·m2·s−3·A−2 Resistance, Impedance, Reactance
ohm metre Ω·m kg·m3·s−3·A−2 Resistivity
watt W V·A = kg·m2·s−3 Electrical power
farad F C/V = kg−1·m−2·A2·s4 Capacitance
farad per metre F/m kg−1·m−3·A2·s4 Permittivity
reciprocal farad F−1 kg1·m2·A−2·s−4 Elastance
siemens S Ω−1 = kg−1·m−2·s3·A2 Conductance, Admittance, Susceptance
siemens per metre S/m kg−1·m−3·s3·A2 Conductivity
weber Wb V·s = kg·m2·s−2·A−1 Magnetic flux
tesla T Wb/m2 = kg·s−2·A−1 Magnetic flux density
ampere per metre A/m m−1·A magnetic induction
ampere-turns per weber A/Wb kg−1·m−2·s2·A2 Reluctance
henry H Wb/A = V·s/A = kg·m2·s−2·A−2 Inductance
henry per metre H/m kg·m·s−2·A−2 Permeability
(dimensionless) χ - Magnetic susceptibility

Amp re can refer to: Amp re (car) Ampere (unit) Andr -Marie Amp re This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Si, si, or SI may stand for: SI, the Système International dUnités (the metric International System of Units) one of two Spanish words pronounced like see: sí (accented) for yes and si (unaccented) for if a French word pronounced like see meaning yes, on the contrary, as... In electricity, current refers to electric current, which is the flow of electric charge. ... The coulomb, symbol C, is the SI unit of electric charge, and is defined in terms of the ampere: 1 coulomb is the amount of electric charge (quantity of electricity) carried by a current of 1 ampere flowing for 1 second. ... Electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interactions. ... In physics the term Quantity of Electricity refers to the quantity of electric charge. ... The volt is the SI derived unit for electric potential and voltage (derived from the ampere and watt). ... In the physical sciences, potential difference is the difference in potential between two points in a conservative vector field. ... The ohm is the SI derived unit of electrical resistance (derived from the ampere and the watt). ... Electrical resistance is a measure of the degree to which an electrical component opposes the passage of current. ... In electrical engineering, impedance is a measure for the manner and degree a component resists the flow of electrical current if a given voltage is applied. ... In the analysis of an alternating-current electrical circuit (for example a RLC series circuit), reactance is the transient part of impedance, and is caused by the presence of inductors or capacitors in the circuit. ... The ohm is the SI derived unit of electrical resistance (derived from the ampere and the watt). ... The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ... The watt (symbol: W) is the SI derived unit for power. ... Transmission lines in Lund, Sweden Electric power, often known as power or electricity, involves the production and delivery of electrical energy in sufficient quantities to operate domestic appliances, office equipment, industrial machinery and provide sufficient energy for both domestic and commercial lighting, heating, cooking and industrial processes. ... The farad (symbol F) is the SI unit of capacitance (named after Michael Faraday). ... Capacitance is a measure of the amount of electric charge stored for a given electric potential. ... The farad (symbol F) is the SI unit of capacitance (named after Michael Faraday). ... The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ... The permittivity of a medium is an intensive physical quantity that describes how an electric field affects and is affected by the medium. ... The farad (symbol F) is the SI unit of capacitance (named after Michael Faraday). ... Electrical elastance is the inverse of capacitance. ... The siemens (symbol: S) is an SI derived unit of measurement for electric conductance, being the inverse of the ohm (Ω), named after Werner von Siemens. ... Electrical conductance is an electrical phenomenon where a material contains movable particles with electric charge, which can carry electricity. ... In electrical engineering, the admittance (Y) is the inverse or reciprocal of the impedance (Z). ... In electrical engineering, the susceptance (B) is the imaginary part of the admittance. ... The siemens (symbol: S) is an SI derived unit of measurement for electric conductance, being the inverse of the ohm (Ω), named after Werner von Siemens. ... The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ... Electrical conductivity is a measure of how well a material accommodates the transport of electric charge. ... This article is in need of attention. ... Magnetic flux, is a measure of quantity of magnetism, taking account of the strength and the extent of a magnetic field. ... The tesla (symbol T) is the SI derived unit of magnetic flux density (or magnetic inductivity). ... Magnetic field density, otherwise known as magnetic flux density, is essentially what the layman knows as a magnetic field - akin to a gravitational or electric field. ... Amp re can refer to: Amp re (car) Ampere (unit) Andr -Marie Amp re This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ... Electromagnetic induction is the production of an electrical potential difference (or voltage) across a conductor situated in a changing magnetic field. ... Amp re can refer to: Amp re (car) Ampere (unit) Andr -Marie Amp re This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Weber is a surname of German origin, derived from the noun meaning weaver. The German pronunciation is best represented in English orthography as VAYBr, while in English it is more likely to be pronounced WEBBr or WAYBr. In some cases, following migration to English-speaking countries, it... Magnetic reluctance is the resistance of a material to a magnetic field. ... The henry (symbol H) is the SI unit of inductance. ... Inductance is a physical characteristic of an inductor, which is an electrical device that produces at any time a voltage proportional to the instantaneous rate of change in current flowing through it. ... The henry (symbol H) is the SI unit of inductance. ... The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ... In electromagnetism, permeability is the degree of magnetisation of a material that responds linearly to a magnetic field. ... In electrical engineering, the magnetic susceptibility is the degree of magnetization of a material in response to a magnetic field. ...

See also

Electrical conductivity is a measure of how well a material accommodates the transport of electric charge. ...

External links

  • http://www.facstaff.bucknell.edu/mastascu/eLessonsHTML/Sensors/TempR.html

  Results from FactBites:
 
Electrical resistance - Wikipedia, the free encyclopedia (1185 words)
Electrical resistance is a measure of the degree to which an object opposes the passage of an electric current.
The SI unit of electrical resistance is the ohm.
R is the resistance of the object, usually measured in ohms.
  More results at FactBites »

 
 

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