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The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size. A good conductor has less resistivity, whereas a bad conductor or insulator has high resistivity. The resistivity of semi-conductors lies between that of conductors and insulators.
What are the factors that affect resistance and resistivity?
There are 4 different factors which affect resistance: The type of material of which the resistor is made. The length of the resistor. The thickness of the resistor. The temperature of the conductor.
What are the factors affecting resistivity Class 10?
Resistivity is a qualitative measurement of a material’s ability to resist flowing electric current.The resistance of the conductor depends on the following factors: The temperature of the conductor. The cross-sectional area of the conductor. Length of the conductor. Nature of the material of the conductor.
What are the two factors that influence resistance?
Resistance is the property of the material that restricts the flow of electrons. There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material.
Why resistance decreases with increase in area?
Adding more wires in parallel decreases the resistance of that circuit path. So, bigger cross sectional area = more wires in parallel = lower resistance. And hence the inverse proportionality relation is responsible for increase in area, decrease in resistance property.
What is the difference between resistance and resistivity Class 10?
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.
How does resistivity change with temperature?
The general rule is resistivity increases with increasing temperature in conductors and decreases with increasing temperature in insulators. As temperature rises, the number of phonons increases and with it the likelihood that the electrons and phonons will collide. Thus when temperature goes up, resistance goes up.
What is the equation of resistivity?
Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l. The unit of resistance is the ohm.
How does current affect resistance?
An electric current flows when electrons move through a conductor, such as a metal wire. This makes it more difficult for the current to flow, and causes resistance. The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through.
What are the two factors that influence resistance the two factors are Brainly?
Resistance :- Length of the Conductor ( R directly proportional to length) Area of cross- section of the conductor ( R inversely proportional to Area of Cross section of the conductor) Nature of material of the Conductor. Temperature ( With temperature resistance increses).
What is the relationship between current and resistance?
The relationship between current, voltage and resistance is expressed by Ohm’s Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant.
Does area increase resistance?
More collisions mean more resistance. Second, the cross-sectional area of the wires will affect the amount of resistance. Wider wires have a greater cross-sectional area. In the same manner, the wider the wire, the less resistance that there will be to the flow of electric charge.
Does resistance depend on temperature?
Since the resistance of some conductor, such as a piece of wire, depends on collisions within the wire itself, the resistance depends on temperature. With increasing temperature, the resistance of the wire increases as collisions within the wire increase and “slow” the flow of current.
Which is directly proportional to the resistance?
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.
Is resistivity directly proportional to resistance?
Resistivity ρ is an intrinsic property of a material and directly proportional to the total resistance R, an extrinsic quantity that depends on the length and cross-sectional area of a resistor.
What is the major difference between resistance and resistivity?
Difference Between Resistance and Resistivity Resistance Resistivity It is the ratio of the length and cross-section area of the conductor. It’s the ratio of product of the resistance and area to the length of the conductor. SI unit is Ω. SI unit is Ω-m.
Is resistivity and resistance same?
Furthermore, an important difference between resistance and resistivity has to do with the flow of free electrons. Also, resistance is an aspect that opposes the flowing of free electrons. In contrast, resistivity is any material’s property that tells the resistance of the material with a particular dimension.
Is resistivity directly proportional to temperature?
Resistivity is indirectly proportional to the temperature. In other words, as you increase the temperature of materials, their resistivities will decrease.
Why does resistivity decrease with temperature?
When the temperature in increased the forbidden gap between the two bands becomes very less and the electrons move from the valence band to the conduction band. Thus when the temperature is increased in a semiconductor, the density of the charge carriers also increases and the resistivity decreases.
Does resistivity depend on length?
The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.
What is resistivity example?
For example, the resistivity of copper is generally given as: 1.72 x 10–8 Ωm. The resistivity of a particular material is measured in units of Ohm-Metres (Ωm) which is also affected by temperature. Conductivity, σ is the reciprocal of the resistivity. That is 1/ρ and has the unit of siemens per metre, S/m.
What is resistivity of any solution?
Resistivity of any solution : When current flow in the solution through two electrodes resistance is proportional to length and inversely proportional to cross sectional area A. The constant p(rho) is called resistivity or specific resistance. Thus, Resistivity of any solution is the resistance of one cm cube.
