Resistividade Elétrica

Sobre Elétrico Resistividade Conversão

Elétrico resistivity (specific resistance) measures a material's inherent opposition to current flow—resistance normalized by geometry. It's a material property, independent of sample dimensions. While resistance depends on an object's size e shape, resistivity remains constant for a given material under fixed conditions. Este distinction é crucial: a long thin copper wire tem higher resistance than a short thick one, but ambos têm identical resistivity because they're o mesmo material. Resistividade enables direct comparison of materials' electrical properties regardless of sample geometry.

O SI unidade é ohm meter (Ω·m). Resistividade spans an enormous range: from 10⁻⁸ Ω·m for metals to 10¹⁶ Ω·m for bom insulators—over 24 orders of magnitude, one of o widest property ranges in física. Temperatura significantly affects resistivity: metals increase resistivity as temperature rises (due to increased lattice vibrations), while semiconductors typically decrease (mais charge carriers são thermally excited). It's o reciprocal of conductivity e essential for electrical engenharia, materials ciência, e semiconductor device design.

Our converter handles todos padrão electric resistivity unidades usado in wire sizing, material characterization, e electronic design.

Comuns Elétrico Resistividade Conversions

Elétrico Resistividade Referência de Unidades

Ohm meter (Ω·m) – O SI unidade for resistivity, representing o resistance of a 1-meter cube measured entre opposite faces. While mathematically correct, Ω·m gives inconveniently small numbers for metals (copper é 1.68 × 10⁻⁸ Ω·m), so prático aplicações often use derived unidades. O relationship R = ρL/A connects resistivity to physical resistance, onde L é length e A é cross-sectional area.

Ohm centimeter (Ω·cm) – O dominant unidade in semiconductor indústria specifications. 1 Ω·cm = 0.01 Ω·m. Silicon wafer resistivity é almost always quoted in Ω·cm, ranging from 0.001 Ω·cm (heavily doped) to 10,000 Ω·cm (high-purity intrinsic). Germanium specifications também use Ω·cm. O centimeter scale matches typical wafer dimensions.

Microohm centimeter (μΩ·cm) – O prático unidade for metallic conductors onde resistivity é muito 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 use este unidade.

Ohm square millimeter per meter (Ω·mm²/m) – O padrão wire indústria unidade, directly relating to wire gauge calculations. Numerically é igual a μΩ·cm × 10 (so copper ≈ 17.2 Ω·mm²/m). Convenient because wire cross-sections são typically specified in mm² e lengths in meters. Directly gives resistance: R = ρ × L, onde L é in meters e ρ é in Ω·mm²/m, yielding R in ohms for 1 mm² wire.

Nanoohm meter (nΩ·m) – 10⁻⁹ Ω·m. Sometimes usado for metals to avoid scientific notation. Copper ≈ 16.8 nΩ·m. Menos comum than μΩ·cm but occasionally seen in física literature.