Question

Define electrical resistivity in easy and short .​

Answer 1

Electrical resistivity is a concept in electrical engineering. It is a measure of how much an electrical conductor stops the flow of electricity through it. Most metals have a very low electrical resistivity.

Answer 2

Explanation:

Relaxation time is the time gap between two successive electron collisions in a conductor.

The relationship between the relaxation time (T) and drift velocity (Vd) is given below.

vd=(eEm)T

Where

vd = drift velocity

e = charge of electron

E = field

m = mass of electron

T = Relaxation time

So the expression for relaxation time (T) is

T=(vdme)E

Let L = Length of the conductor

A = Area of the conductor

n = current density

then current flowing through the conductor is

I=−neAvd I=neA(eEm)T I=ne2EAmT

Feild E can be expressed as

E = V/L

Then current flowing through the conductor becomes

I=ne2VAmLT VI=mLne2TA

From ohm’s law

V = IR

R = V/I

R=(mne2T)LA R=ρLA