# What is Resistivity?

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. Materials that conduct current easily is known as conductors and they have low resistivity. Those who do not conduct electricity are known as insulators and they have high resistivity. The resistivity is defined in terms of the magnitude of the electric field across it that gives a certain current density. The electrical resistivity formula is given as:

$$rho =frac{E}{J}$$

Where,

ρis the resistivity of the material in ohm metres, Ω⋅m

E is the magnitude of the electric field in volts per metre,

J is the magnitude of the current density in amperes per square metre,

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