Beta version#
BETA TEST VERSION OF THIS ITEM
This online calculator is currently under heavy development. It may or it may NOT work correctly.
You CAN try to use it. You CAN even get the proper results.
However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.
Feel free to send any ideas and comments !
This online calculator is currently under heavy development. It may or it may NOT work correctly.
You CAN try to use it. You CAN even get the proper results.
However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.
Feel free to send any ideas and comments !
Settings#
| Unit (resistivity (20°c)) | ||
| Unit (conductivity (20°c)) | ||
| Decimals |
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metals#
| Substance | Molecular formula | Resistivity (20°C) [Ω × m] | Conductivity (20°C) [MS × m] |
| aluminum (pure) | Al | 2.65×10-8 | 37.74 |
| copper (pure) | Cu | 1.68×10-8 | 59.52 |
| gold | Au | 2.44×10-8 | 40.98 |
| iron | Fe | 9.7×10-8 | 10.31 |
| lead | Pb | 2.2×10-7 | 4.55 |
| manganese | Mn | 1.44×10-6 | 0.69 |
| nickel | Ni | 6.99×10-8 | 14.31 |
| platinum | Pt | 1.06×10-7 | 9.43 |
| silicon | Si | 640 | 1.56×10-9 |
| silver | Ag | 1.59×10-8 | 62.89 |
| tin | Sn | 1.09×10-7 | 9.17 |
| titanium | Ti | 4.2×10-7 | 2.38 |
| tungsten | W | 5.6×10-8 | 17.86 |
| zinc | Zn | 5.9×10-8 | 16.95 |
liquids#
| Substance | Molecular formula | Resistivity (20°C) [Ω × m] | Conductivity (20°C) [MS × m] |
| mercury | Hg | 9.8×10-7 | 1.02 |
| water, sea | - | 0.2 | 5×10-6 |
plastics#
| Substance | Molecular formula | Resistivity (20°C) [Ω × m] | Conductivity (20°C) [MS × m] |
| rubber, hard | - | 1×1013 | 1×10-19 |
other materials#
| Substance | Molecular formula | Resistivity (20°C) [Ω × m] | Conductivity (20°C) [MS × m] |
| glass | - | 1×1013 | 1×10-19 |
| diamond | C | 1×1012 | 1×10-18 |
| graphite | C | 3×10-5 | 3.33×10-2 |
other inorganic#
| Substance | Molecular formula | Resistivity (20°C) [Ω × m] | Conductivity (20°C) [MS × m] |
| sulfur | S2 | 1×1015 | 1×10-21 |
Some facts#
- Resistivity is a property of a given material (substance).
- Resistivity determines the ability to conduct an electric current. Higher resistivity means, that the material conducts electric current worse.
- Resistivity is usually marked with a small Greek letter (read as "rho").
- The basic SI unit of resistivity is ohm times metre:
- If we have a conductor with given dimensions and known material resistivity, then we can calculate its total electric resistance:where:
- - wire resistance as a whole, this value should be shown by an ohmmeter applied to the two ends of the wire,
- - material resistivity from which the conductor (wire) is made,
- - the length of the wire,
- - cross-sectional area of the conductor (wire).
- - wire resistance as a whole, this value should be shown by an ohmmeter applied to the two ends of the wire,
- The resistivity, depends on the type of material, but also depends on temperature. The parameter describing how easy given material changes resistance when changing temperature is the temperature coefficient of resistance .
- The temperature coefficient tells us how much the conductor resistance will change when we change the temperature by one Kelvin.
- If we know the resistance of the conductor at a given temperature (the so-called reference temperature) and we have the temperature coefficient of the material from which that conductor is made, we can calculate its resistance at another temperature:where:
- – wire resistance at temperature ,
- – wire resistance at known (reference) temperature
- – temperature coefficient of resistance,
- – temperature change in Kelvins.
- – wire resistance at temperature ,
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