Quick Answer: What Is Resistivity In Physics?

Resistivity, electrical resistance of a conductor of unit cross-sectional area and unit length. A characteristic property of each material, resistivity is useful in comparing various materials on the basis of their ability to conduct electric currents. High resistivity designates poor conductors.

What is resistivity with example?

For example, the resistivity of copper is generally given as: 1.72 x 108 Ωm. The resistivity of a particular material is measured in units of Ohm-Metres (Ωm) which is also affected by temperature. Conductivity, σ is the reciprocal of the resistivity. That is 1/ρ and has the unit of siemens per metre, S/m.

What is the best definition of resistivity?

1: the longitudinal electrical resistance of a uniform rod of unit length and unit cross-sectional area: the reciprocal of conductivity. 2: capacity for resisting: resistance.

How can we define resistivity?

Resistivity of the material is defined as the resistance offered to current flow by a conductor of unit length having unit area of cross-section. It is the property of the material, does not depend on physical dimensions. Unit is ohm-metre(Ωm) Resistance of an object is related to resistivity as follows: R=Aρ l​

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What is resistivity class 10th?

Resistivity is defined as the electrical resistance of a conductor of unit cross-sectional area and unit length. The resistance of any conductor is directly proportional to the length of the conductor and inversely proportional to the area of cross-section of the conductor.

What is resistivity and its formula?

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. The unit of resistance is the ohm.

Why is resistivity important?

The resistivity of materials is important as it enables the right materials to be used in the right places in electrical and electronic components. Materials used as conductors, for example in electrical and general connecting wire need to be able to have a low level of resistivity.

What is the difference between resistivity and resistance?

Resistance is defined as the property of the conductor which opposes the flow of electric current. Resistivity is defined as the resistance offered by the material per unit length for unit cross-section.

What factors does resistivity depend on?

The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size. The SI unit of electrical resistivity is the ohm-meter. Hence resistivity is dependent on the temperature.

What is another word for resistivity?

In this page you can discover 14 synonyms, antonyms, idiomatic expressions, and related words for resistivity, like: impedance, electric-resistance, electrical-resistance, resistance, ohmic resistance, conductivity, magnetometry, coercivity, gradiometer, magnetometer and anisotropy.

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What is the SI unit of resistivity?

The SI unit of electrical resistivity is the ohm-meter (Ω⋅m).

What is meant by 1 ohm?

One ohm is equal to the resistance of a conductor through which a current of one ampere flows when a potential difference of one volt is applied to it.

What is Ohm’s law state?

Ohm’s law states that the current through a conductor is proportional to the voltage across the conductor. V=IR where V is the voltage across the conductor and I is the current flowing through it.

What is rheostat class 10th?

A rheostat is a variable resistor or an adjustable resistor. Its resistance can be varied as desired.It is a continuous resistance varying device used to change the magnitude of current in a circuit by changing the length of the resistance wire inserted into the circuit.

What is Ohm’s law class 10th?

Ohm’s Law states that the current flowing through a conductor is directly proportional to the potential difference applied across its ends, provided the temperature and other physical conditions remain unchanged. Ohm’s Law shows the relationship between the voltage (V), current (I) and resistance (R).

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