Resistività elettrica

Informazioni Electric Resistivity Conversione

Electric resistivity (specific resistance) measures un material's inherent opposition un current flow—resistance normalized da geometry. It's un material property, independent di sample dimensions. While resistance depends on un object's size e shape, resistivity remains constant per un given material under fixed conditions. This distinction e crucial: un long thin copper wire ha higher resistance than un short thick one, but both hanno identical resistivity because they're il same material. Resistivity enables direct comparison di materials' electrical properties regardless di sample geometry.

Il SI unit e ohm metro (Ω·m). Resistivity spans un enormous range: da 10⁻⁸ Ω·m per metals un 10¹⁶ Ω·m per good insulators—over 24 orders di magnitude, one di il widest property ranges in physics. Temperature significantly affects resistivity: metals increase resistivity as temperature rises (due un increased lattice vibrations), while semiconductors typically decrease (more charge carriers sono thermally excited). It's il reciprocal di conductivity e essential per electrical engineering, materials science, e semiconductor device design.

Our converter handles all standard electric resistivity units used in wire sizing, material characterization, e electronic design.

Comuni Electric Resistivity Conversions

Electric Resistivity Unita Riferimento

Ohm metro (Ω·m) – Il SI unit per resistivity, representing il resistance di un 1-metro cube measured tra opposite faces. While mathematically correct, Ω·m gives inconveniently small numbers per metals (copper e 1.68 × 10⁻⁸ Ω·m), so practical applications often usare derived units. Il relationship R = ρL/A connects resistivity un physical resistance, dove L e length e A e cross-sectional area.

Ohm centimetro (Ω·cm) – Il dominant unit in semiconductor industry specifications. 1 Ω·cm = 0.01 Ω·m. Silicon wafer resistivity e almost always quoted in Ω·cm, ranging da 0.001 Ω·cm (heavily doped) un 10,000 Ω·cm (high-purity intrinsic). Germanium specifications also usare Ω·cm. Il centimetro scale matches typical wafer dimensions.

Microohm centimetro (μΩ·cm) – Il practical unit per metallic conductors dove resistivity e very low. Copper ≈ 1.68 μΩ·cm; silver ≈ 1.59 μΩ·cm; aluminum ≈ 2.65 μΩ·cm; gold ≈ 2.44 μΩ·cm. 1 μΩ·cm = 10⁻⁸ Ω·m = 10⁻⁶ Ω·cm. Wire tables e conductor specifications typically usare this unit.

Ohm square millimetro per metro (Ω·mm²/m) – Il standard wire industry unit, directly relating un wire gauge calculations. Numerically equivale un μΩ·cm × 10 (so copper ≈ 17.2 Ω·mm²/m). Convenient because wire cross-sections sono typically specified in mm² e lengths in metri. Directly gives resistance: R = ρ × L, dove L e in metri e ρ e in Ω·mm²/m, yielding R in ohm per 1 mm² wire.

Nanoohm metro (nΩ·m) – 10⁻⁹ Ω·m. Sometimes used per metals un avoid scientific notation. Copper ≈ 16.8 nΩ·m. Less common than μΩ·cm but occasionally seen in physics literature.