# What is electrical resistivity Ncert?

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Electric resistivity is defined as the electrical resistance offered per unit length and unit cross-sectional area at a specific temperature and is denoted by ρ. Electrical resistance is also known as specific electrical resistance.

## What is meant by electrical resistivity?

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.

## What is electrical resistivity class 10th?

Electrical resistivity is the reciprocal of electrical conductivity. It is the measure of the ability of a material to oppose the flow of current. Materials resist the flow of electric current. … Resistivity is defined as the electrical resistance of a conductor of unit cross-sectional area and unit length.

## What is resistivity Ncert?

Resistivity. Resistivity is also known as specific resistance. It is the resistance of the specific material; also it is specific to a material. R=ρ, If A and L =1 in Equation R= ρ (L/A). Resistivity is defined as resistance of unit length and unit area of a conductor.

## What is resistivity Class 10 BYJU’s?

The electrical resistivity of a material is the measure of how strongly the material opposes the flow of current. The SI unit of electrical resistivity is the ohm⋅metre(Ω⋅m). It is commonly represented by the Greek letter ρ, rho.

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## What is electrical resistivity used for?

At the most basic level, electrical resistivity (ER) (as used in geophysics) is the measurement of ground variations gathered by applying a small and highly controlled electric current across an array of electrodes.

## Which conductor has highest resistivity?

Generally alloys have more resistivity than individual metals so Nichrome being an alloy will have highest resistivity than silver , copper and aluminium.

## What is called resistance?

Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). Ohms are named after Georg Simon Ohm (1784-1854), a German physicist who studied the relationship between voltage, current and resistance.

## How can we define 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 1volt?

An Ampere can be defined as the unit of electric current that is equal to the flow of one Coulomb per second. One ampere of current represents one coulomb of electrical charge, i.e. 6.24×1018 charge carriers, moving in one second. 1 Ampere = One Columb (C)/One second (S) 4 (10)

## What is the resistivity of pure water?

What is resistivity in water?

Type of Water Approximate resistivity in Ohms (Ω)
Pure Water 20,000,000
Distilled Water 500,000
Rain Water 20,000
Tap Water 1,000 – 5,000 Ω

## What is resistivity derive its formula?

Resistivity is the resistance per unit length and cross-sectional area. … We know that R = ρ L / A. Thus we can derive the expression for resistivity from this formula. ρ = R A / L, where R is the resistance in ohms, A is the area of cross-section in square meters and L is the length in meters.

## What is resistivity of any solution?

Resistivity of any solution : When current flow in the solution through two electrodes resistance is proportional to length and inversely proportional to cross sectional area A. The constant p(rho) is called resistivity or specific resistance. Thus, Resistivity of any solution is the resistance of one cm cube. 