What is the unit of resistivity?

The unit of resistivity is ohm·meter (Ω·m), which represents the resistance per unit length and cross-sectional area. Resistivity is determined by resistance, cross-sectional area, and length, and different materials have different resistivities. Resistivity affects the resistance of wires, the conductivity of circuit boards, and the efficiency of heating elements.

Resistivity unit: ohm·meter (Ω·m)

Resistivity is a material property that represents Resistance per unit length, cross-sectional area. Its unit is ohm·meter (Ω·m).

The definition and calculation formula of resistivity

The definition of resistivity (ρ) is:

<code>ρ = R * A / L</code>

where:

• R is the resistance (unit: ohm, Ω)
• A is the cross-sectional area (unit: square meter, m²)
• L is the length (unit: meter, m)

The resistivity of different materials

The resistivity of materials varies from material to material. For example:

• Copper: 1.68 × 10⁻⁸ Ω·m
• Aluminum: 2.65 × 10⁻⁸ Ω·m
• Steel: 1.05 × 10⁻⁶ Ω·m
• Rubber: 10¹³ Ω·m

The importance of resistivity

Resistivity is an important material property, Because it affects:

• The resistance of the wire, which in turn affects the current and voltage
• The conductivity of the circuit board
• The efficiency of the electric heating element

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