Question

What do you mean by Resistance, Resistor, Resistivity. Write its formula and Si unit.

Answer 1

Resistance:It is the property of a conductor to resist flow of charges through it. It's formula is R=V/I and it's SI unit is ohm.
Resistor:A conductor having some appreciable resistance is called a resistor.Since it is a device and not a physical quantity therefore it does not have a formula and SI unit.
Resistivity:It is a characteristic property of the material of the conductor.Its formula is rho=RA/l and it's SI unit is ohm metre.
thank u ,hope it helps!^_^

Answer 2

A resistor is an electronic component that limits or 'resists' the flow of electrons in a circuit. They are one of the basic electronic components and are generally used for power control.The resistor's ability to reduce the current is called resistance and is measured in units of ohms (symbol :

The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current which flows through it: If the resistance is constant over a considerable range of voltage, then Ohm's law, I = V/R, can be used to predict the behavior of the material.