Conductivity

Conductivity

The conductivity meter is a device designed to measure a characteristic of all materials the conductivity. The conductivity is measured in Siemens * m2 / m, or what is the same Sm * m. Siemens is a unit, the cross sectional area of ​​the driver, about the length of the driver (A driver more "thick" lead a longer more and less). In short the conductivity says how easy electricity through that material.

The conductivity can be measured directly or inversa.De directly, how much current is observed for a given difference in voltage between the ends of the sample.

Indirectly, there is much potential difference is generated by a given current, that is actually measured the resistivity, which is the inverse of conductivity. The resistivity is measured in Ohm * m/m2 (or its multiples and submultiples, of course). The relationship between conductivity and resistivity is the inverse, ie 1uSm (1 microsiemen = 10 ^ -6) = 1MOhm (1megaohm = 10 ^ 6).

Unlike the voltage and current, the conductivity is a physical property of materials, not of a circuit.

That is, a cable, or a piece of metal, or an espadrille, have a certain behavior, and not depend on the circuit in which are stuck.

Therefore, the conductivity is not measured in parallel or in series, but it is measured in a sample of material, regardless of how it is measured.

If you want to know the conductivity of a given material, you can make home-made with two polymers, one way of voltmeter and ammeter another mode.

Place the ammeter in series with the sample in a DC circuit. Then put the voltmeter in parallel with the muestra.V = I * R as the law of Ry bags ohm.Alli conductivity (say C, not to be confused with capacity) C = 1/RTienes conductivity of your sample.

Note that the conductivity is not always a linear function. Materials are starting to drive over a certain voltage applied to them, or leading to different rates according to them. The capacity is also strongly affected by temperature.

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