Question

Derive an expression to show that a current carrying conductor with a uniform cross-
sectional area (A) and length (l) has resistance equals to R = (
l
σA
) as it follows
Ohm’s Law i.e. V = IR.

Answer 1

Answer:

Most basic components of electricity are voltage, current, and resistance. Ohm’s law shows a simple relation between these three quantities. Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

ohm's law

Ohm’s Law Formula

Voltage= Current× Resistance

V= I×R

V= voltage, I= current and R= resistance

The SI unit of resistance is ohms and is denoted by Ω

This law is one of the most basic laws of electricity. It helps to calculate the power, efficiency, current, voltage, and resistance of an element of an electrical circuit.