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. Specific resistance for materials are given in units of Ω-cmil/ft or Ω-meters (metric).
What is the unit of specific resistance is?
If the distances are expressed in meter (m), the SI unit of specific resistance is given by
Ohmm (Ω . m)
. The SI unit of conductivity is Ohm-1 m-1 or siemens m-1 (S . m-1).
What is a specific resistance?
Definition of ‘specific resistance’
1.
the electrical property of a material that determines the resistance of a piece of given dimensions
. It is equal to RA/ l, where R is the resistance, A the cross-sectional area, and l the length, and is the reciprocal of conductivity. It is measured in ohms. Symbol: ρ.
What is specific resistance and write its units?
The SI unit of resistance is
Ohm (Ω)
. The SI unit of length is metre (m). The SI unit of cross sectional area is metre-squared (m2). Hence, the SI unit of specific resistance is Ohm-metre (Ω.
What is the symbol for resistivity?
Resistivity, commonly symbolized by the
Greek letter rho, ρ
, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l.
What is the other name of specific resistance?
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 specific resistance and its formula?
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. Specific resistance for materials are given in units of Ω-cmil/ft or Ω-meters (metric).
Which is bigger k ohm or ohm?
One kiloohm is equal to 1,000 ohms
, which is the resistance between two points of a conductor with one ampere of current at one volt. The kiloohm is a multiple of the ohm, which is the SI derived unit for electrical resistance.
What is Ohm’s law and define specific resistance?
I=VR I = V R
. This relationship is also called Ohm’s law. Ohm’s law in this form really defines resistance for certain materials. … Ohmic materials have a resistance R that is independent of voltage V and current I. An object that has simple resistance is called a resistor, even if its resistance is small.
What is the dimension of specific resistance?
[
ML2T−2A−2]
What is difference between resistance and specific resistance?
Resistance is related with a
particular conductor
. At a fixed temperature amount of resistance offered in the flow of current by a conductor having unit length and unit cross section is called its specific resistance. … Specific resistivity of conductor depends on the material of the conductor and its temperature.
What is specific resistance in the immune system?
Adaptive immunity is defined by three important characteristics: specificity and memory. Specificity refers to the adaptive immune system’s ability to target specific pathogens, and memory refers to its ability to quickly respond
to pathogens
, also known as specific resistance, to which it has previously been exposed.
What is specific resistance of a wire?
The Specific Resistance (K) of a material is
the resistance offered by a wire of the material which is one foot long with a diameter of one MIL
. Material.
What is an ohm test?
This test, using a digital multimeter, determines whether:
an electrical circuit is complete or broken
.
the resistance of a component matches the manufacturer’s specification
.
What is resistivity in simple words?
Resistivity is
a measure of the resistance of a given size of a specific material to electrical conduction
. … Materials that conduct electrical current easily are called conductors and have a low resistivity. Those that do not conduct electricity easily are called insulators and these materials have a high resistivity.
Which is the highest resistivity?
Nichrome
has the highest resistivity and shows the heating effect of electric current because of its high resistance, it opposes the flow of current and hence, it produces a lot of heat.
