Unit of Specific Resistance

What Is Specific Resistance?

Specific resistance is defined as the resistance offered per unit length and unit cross-sectional area when a known amount of voltage is applied. The mathematical representation is as follows:

$$\begin{array}{l}\rho =\frac{RA}{L}\end{array}$$

Where,

⍴: specific resistance

R: resistance

A: cross-sectional area

L: length of the material

Specific resistance is the reciprocal of specific conductance, which is defined as a measure of a material’s ability to conduct electricity. The symbolic representation of specific conductance is 𝛋. It may also refer to:

• Specific electric resistance
• Specific airway resistance
• Specific resistance due to friction for a mechanism transporting mass.
 Material Specific resistance at 20 °C ohm-metre Silver 1.59 x 10 Copper 1.72 x 10-8 Gold 2.24 x 10-8 Tungsten 5.65 x 10-8

Unit of Specific Resistance

SI unit of specific resistance is ohm meter (Ωm).

What Is Electric Resistivity?

Specific electrical resistance is also known as electric resistivity is a property of material defining how strongly can the material oppose the flow of electric current. SI unit of electrical resistivity is ohm-meter and is represented as ⍴.

What Is Airway Resistance?

Airway resistance is studied in respiratory physiology and is defined as the resistance of the respiratory tract to airflow during inhaling and exhaling. Following is the formula similar to Ohm’s law:

$$\begin{array}{l}R_{AW}=\frac{\Delta P}{\dot{V}}\end{array}$$

Where,

$$\begin{array}{l}\Delta P=P_{ATM}-P_{A}\end{array}$$
$$\begin{array}{l}R_{AW}=\frac{P_{ATM}-P_{A}}{\dot{V}}\end{array}$$

Where,

RAW: airway resistance

ΔP: pressure difference driving airflow

PATM: atmospheric pressure

PA: alveolar pressure

$$\begin{array}{l}\dot{V} \, : \, volumetric \,\, airflow\end{array}$$

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Watch the video and find out the factors affecting the resistance

Q1

What is meant by resistance?

It is a measurement of the opposition to the flow of current in an electrical circuit.
Q2

What is meant by specific resistance?

Specific resistance is the resistance offered per unit length and cross-sectional area when a known amount of voltage is applied.
Q3

What are the quantities that control the specific resistance?

The quantities that control the specific resistance are resistance, cross-sectional area and length of the material.
Q4

What is the unit of specific resistance?

The SI unit of specific resistance is ohm meter (Ωm).
Q5

What is the specific resistance of copper?

The specific resistance of copper is 1.72 ×
$$\begin{array}{l}10^{-8} \end{array}$$
ohm meter.

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