Specific Resistance

July 09, 2024 Post a Comment

Specific resistance

Specific Resistance (”ρ”) is a property of any conductive material, a figure used to determine the end-to-end resistance of a conductor given length and area in this formula: R = ρl/A.

What is specific resistance and its unit?

Specific resistance is also known as resisitivity. The resistivity of a material is the resistance of a wire of that material of unit length and unit area of cross-section. Its S.I. unit is ohm-metre.

What is specific resistance or resistivity?

Resistivity or specific resistance of a material is a measure of the resistance, which it offers to the flow of current through it. It is an intrinsic property of a material. Specific resistance depends on the composition, temperature, pressure of the material.

What is specific resistance class 11?

Specific resistance is defined as "the resistance offered per unit length and unit cross-section area of that material when a known quantity of voltage applied at its end ''. The SI unit of specific resistance is Ohm-m.

What does specific resistance depend on?

Thus, specific resistance depends on the area, resistance, length, temperature and material of the conductor.

What is the other name of specific resistance?

Specific electrical resistance (also known as electric resistivity)

What is the SI unit of specific resistance *?

Ohm (. m) is the SI unit for specific resistance is ohm-meters (Ω m), whereas Ohm is the SI unit for electrical resistance.

What is the unit of specific?

The unit of specific conductance is siemen. Explanation: Conductivity, also known as specific conductance, is the ability of a material to conduct electricity.

Is Ohm's law is universal law?

No. Ohm's law is not a universal law. This is because Ohm's law is only applicable to ohmic conductors such as iron and copper but is not applicable to non-ohmic conductors such as semiconductors.

Does specific resistance depend on length?

Specific resistance of a wire is an intrinsic property of the material of wire, so it depends only on the material of the wire but not on the dimensions of the wire.

What is the specific resistance of a wire?

The specific resistance or resistivity of a wire is the property of the material of it. It does not depend on mass, length or cross-section of wire. It may change with temperature.

What is the unit of conductivity?

The SI unit of electrical conductivity is siemens per metre (S/m).

What is the unit of capacitance?

A farad (F) is the standard unit of capacitance (C) in the International System of Units (SI). It indicates the ability of a substance to hold an electric charge. The value of most electrical capacitors is expressed in farads, microfarads (µF) or nanofarads (nF).

What are the limitations of Ohm's law?

Limitations of Ohm's Law Ohm's law is not applicable for unilateral electrical elements like diodes and transistors as they allow the current to flow through in one direction only. For non-linear electrical elements with parameters like capacitance, resistance, etc.

What is the factor that affects the specific resistance of a substance?

Temperature: Heating a wire increases its resistance. Electrical resistance also depends on temperature. At a certain temperature and for a particular substance. Length of wire: Thick wires have less resistance than thin wires.

Where is Ohm's law applicable?

Explanation: According to the Ohm's law, it is applicable only to conductors. Hence, Ohm's law is not applicable in case of insulators.

How does resistance depend on length and radius?

Where R is the resistance of the conductor, L is the length of the conductor and A is the cross-sectional area of the conductor. So, we can say that the resistance of a wire is inversely proportional to the square of the radius of the wire.

What is area specific resistance?

ASR = Rp*A/2 (where, A = Effective current collecting area, Rp = Polarization resistance ) 2. ASR = Rp/2. 3. Conductivity = total anode thickness/ASR.

What is the dimension of specific resistance?

Thus dimension of ρ is [ML3T−3A−2]

What is the specific resistance of water?

As previously mentioned, a specific resistance 18.2 MΩ × cm (million ohms) at 25°C is considered to be absolute pure water. This only accounts for the dissolved ionic impurities commonly found in water.