What is resistivity?

Resistivity ρ is an intrinsic property of a material, independent of its shape or size. The resistance R of a uniform cylinder of length L, of cross-sectional area A, and made of a material with resistivity ρ, is The table below gives representative values of ρ.

What is a unit of resistance?

Resistance is the opposition that a substance offers to the flow of electric current. It is represented by the uppercase letter R. The standard unit of resistance is the ohm. Electrical resistance is directly proportional to length (L) of the conductor and inversely proportional to the cross-sectional area (A).

Why do different materials have different values of resistivity?

Different materials have different values of resistivity. As illustrated in the equation above, resistance is directly proportional to resistivity. A resistor is a passive electrical component that adds a specific value of resistance to an electric circuit. Resistors are used to reduce current flow, adjust voltages, among others.

What is electrical resistance?

It is the property of substance by virtue of which it opposes the flow of current through it, is known as electrical resistance. In this article, we are going to learn all about Electrical Resistance, factors affecting electrical resistance, Ohm’s Law and the combination of resistors.