What is meant by resistance per unit length?

Resistance per unit length is “the ratio of specific resistance or resistivity to the area of cross- section of a given conducting material”.

How does resistance per unit length vary with increasing diameter?

The greater the diameter of the cylinder, the more current it can carry (again similar to the flow of fluid through a pipe). In fact, R is inversely proportional to the cylinder’s cross-sectional area A. The larger its cross-sectional area A, the smaller its resistance.

How resistance per unit length and specific resistance differ from each other?

The unit of resistance is ohm (Ω). Resistance of conductor depends on its length, temperature, cross section area, material of the conductor. The unit of specific resistance is ohm-meter (Ω-m). Specific resistivity of conductor depends on the material of the conductor and its temperature.

How does resistance vary with diameter?

Resistance is inversely proportional to cross sectional area. So if the diameter is halved the cross-sectional area is quartered and the resistance is quadrupled.

How does resistance change if the length of the wire is increased?

The resistance is directly proportional to the length of the wire, the longer the wire the greater the resistance. Well the longer the wire the more collisions the electrons will have with the atoms in the way from one end of the wire to the other. Therefore the resistance will increase as the length increases.

What is the difference between resistance and specific resistivity?

Resistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons. Resistivity is the physical property of a particular substance which is having particular dimensions. Resistivity is only proportional to the nature and temperature of the particular material.

What determines the resistance of a wire?

The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. Resistance also depends on the material of the conductor. The resistance of a conductor, or circuit element, generally increases with increasing temperature.

What is the unit of resistance *?

Ohm
The SI unit of resistance is Ohm.

What is the resistance for a given diameter wire?

The resistance for a given diameter wire is given in ohms per foot or meter. The resistance of a long wire is simply the resistance per foot times the length in feet. Resistance of a conducting object is Rho times the Length/cross section area.

What is the meaning of resistance per unit length?

Resistance per unit length is “the ratio of specificresistance or resistivity to the area of cross- section of a given conducting material”. Therefore,Resistance per unit length is the ratio of specificresistance or resistivity to the area of cross-section of given conductor in Ohm per meter.

How does the length affect the resistance of a conductor?

Resistance of a conducting object is Rho times the Length/cross section area. Rho, the resistivity, is a constant for each material, like copper or silver or aluminum. So increasing the length increases the resistance. If you use a larger diameter then the resistance goes down because the cross section area has increased.

What is the relationship between resistivity and length?

Length, on the other hand, is the physical dimensional measurement of extension between two points. The relation between length and resistivity is given by the resistivity formula. Resistance is directly proportional to the length. This means that any change in length of the material will change its value of resistance.