What does resistivity of A metal depend on?
The resistivity of a substance depends on two factors: The nature of the material. The temperature of the material.
Resistivity depends on the temperature of the material. At a constant temperature, we can assume the resistivity is a constant, and use Ohm's Law which states that the resistance will be constant.
The resistivity of a material depends on its nature and the temperature of the conductor.
The resistivity of a conductor is defined as the resistance offered by the material per unit length for a unit cross-section. It is denoted by the symbol ρ The formula is. A L , is the resistance of the material, is the area of cross-section and is the length.
Resistivity is a material property of the conductor. It depends only on the temperature of the conductor and not on the length or density of the material. Increasing the length increases the resistance of the body but not the resisitivity.
The resistivity of a material is dependent upon the material's electronic structure and its temperature. For most (but not all) materials, resistivity increases with increasing temperature.
Restivity is affected by temperature - for most materials the resistivity increases with temperature. An exception is semiconductors (e.g. silicon) in which the resistivity decreases with temperature. The ease with which a material conducts heat is measured by thermal conductivity.
The resistance is a measure of how difficult it is to pass current through a wire or component. Resistance depends on the resistivity. The resistivity is a characteristic of the material used to fabricate a wire or other electrical component, whereas the resistance is a characteristic of the wire or component.
The resistivity of a conductor increases with temperature.
Resistivity depends upon the temperature, that is, it changes with the change in the temperature. Thus, resistivity is dependent of the type of material, and temperature. but it is independent of the shape of the resistor.
What are 3 factors that affect resistance?
length - longer wires have greater resistance. thickness - smaller diameter wires have greater resistance. temperature - heating a wire increases its resistance.
Resistivity is indirectly proportional to the temperature. As there is an increase in the temperature of materials, their resistivities will decrease. But this is not true for every material, i.e., all materials do not have the same dependence on temperature.
As the temperature increases, the resistivity of the metal increases as well, giving it a positive temperature coefficient of resistance. At high temperatures, the conductor resistivity increases and conductivity decreases.
The magnetic field dependence of resistivity and thermopower show either reversible or irreversible behavior near TM, depending on whether the sample is zero-field cooled or field-cooled, which indicates that the electronic band structure near TM is magnetic history dependent.
The greater the resistivity, the higher the resistance. The larger the difference between the outer radius and the inner radius, that is, the greater the ratio between the two, the greater the resistance.
Resistivity is the intrinsic property of the material that does not depend on the dimension of the material. So resistivity of the wire does not change with the change in thickness of the wire.
Final Answer: From the above discussion it can be concluded that the resistance offered by the wire depends only upon the length, material, and cross-sectional area and will be independent of the voltage applied and the current flowing through it.
Electrical resistivity is the reciprocal of electrical conductivity. It is the measure of the ability of a material to oppose the flow of current. Metals are good conductors of electricity. Hence, they have low resistivity.
A material with high resistivity means it has got high resistance and will resist the flow of electrons. A material with low resistivity means it has low resistance and thus the electrons flow smoothly through the material. For example, Copper and Aluminium have low resistivity. Good conductors have less resistivity.
A high-resistivity material means it has high resistance and can resist electron flow. A low resistivity material means it has low resistance and therefore the electrons pass through the material smoothly. Copper and aluminium, for example, have low resistivity. Less resistivity has good conductors.
What is difference between resistivity and resistance?
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.
Length of wire: Thick wires have less resistance than thin wires. Longer wires have more resistance than short wires. Area of the cross-section of the wire: Smaller diameter wires have greater resistance. Nature of the material: The copper wire has less resistance to thin steel wire of the same size.
The three most important factors affecting resistance are blood viscosity, vessel length and vessel diameter and are each considered below.
In alloys, higher resistivity is caused by the additional scattering of electrons known as alloy scattering. In fact, alloys have better properties than their constituent metals.
Nichrome has the highest resistivity and shows the heating effect of electric current because of its high resistance, it opposes the flow of current and hence, it produces a lot of heat.
Resistivity is indirectly proportional to the temperature. In other words, as you increase the temperature of materials, their resistivities will decrease.
Note: The resistivity of a conductor depends only on the above mentioned three factors i.e., length, area of cross-section, and nature of the material of the conductor. Additionally, it also depends upon the physical conditions like temperature and pressure but is independent of its shape and size.
The resistivity is observed to be strongly dependent on frequency. The resistivity decreases with increasing frequency, with a greater decrease for small saturations and vanishing frequency dependence at complete saturation.
The heating effect of an electric current depends on three factors: The resistance, R of the conductor. A higher resistance produces more heat.
Due to increase in temperature, the thermal velocities of free electrons also increases. Therefore, the number of collisions between free electrons and atoms increases. This increases the opposition to the movement of electrons and hence the resistance of the conductor.
What are the 4 factors that affect the resistivity of electrical metals?
- Mechanical stressing.
- Age Hardening.
- Cold Working.
- Resistance is proportional to length. ...
- Resistance is inversely proportional to cross-sectional-area. ...
- Resistance depends on the material the wire is made of. ...
- Resistance increases with the temperature of the wire.
The resistivity is a material property, whilst resistance (R) refers only to a specific sample. The relationship between these two quantities is defined as: ρ = (S/l) R, where S stands for cross-section area of the sample and l for its length. In most materials (e.g. metals), the current is carried by electrons.
Heating the wire increases resistivity. Increasing resistivity decreases current flow to the lamp, eventually causing it to stop lighting.