factors on which resistance depends

when the length is doubled of a conductor the resistivity does not change since it does not depend on the length of the conductor and depends only on the nature of material. Your email address will not be published. All Rights Reserved. Length of the conductor is double, means you are stretching that given length to double it. Its value depends upon the nature of conductor i.e copper, iron, tin, and silver would each have different values of ρ. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. Our counselor will call to confirm your booking. What do you mean by Thermal conductivity? Where Rt is the total resistance and Rn is the last resistor in the series string. Length The resistivity of a material is the resistance of a wire of that material of unit length and unit cross-sectional area. Conductivity and resistivity are inversely proportional. Therefore, wire, which typically has a very small resistance, becomes warm when there is sufficient current through it. Therefore, R=ρ L/A The resistance of some materials decreases tremendously with a decrease in temperature in the very low temperature range of the order of absolute zero. Resistivity is defined as the measure of the resisting power of a specified material to the flow of an electric current. Resistance is defined as the opposition to the flow of electrical current through a conductor. The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size. The resistivity increases in increasing the temperature of material. There are four factors on which resistance depends. At a certain temperature and for a particular substance. Resistance is the characteristic of a material which opposes the flow of electric current. When did organ music become associated with baseball? Participate in learning and knowledge sharing. Resistance of uniform metallic conductor is directly proportional to its length and inversely proportional to area of cross-section. It has only one path going from the positive(+) side of the source to the negative (_) side. See also: Types of electric charge. Resistance decreases with an increase in temperature. Thick wires have less resistance than thin wires. This means that the current passing through each resistor is the same. resistivity of the conducter will not change with an increase in the length as it depends only on the nature of the conducter and temperature. The resistivity of a metallic conductor increases with an increase in its temperature, whereas the resistivity of a semi-conductor decreases with an increase in its temperature. Satya Prakash Public School Physics Project Topic : Study of various factors on which the b internal resistance/EMF of a cell b b depends. The unit for resistivity is the ohm-metre. according to their level or resistivity. Area of cross section What are examples of 1st, 2nd, and 3d class levers? Is one joule per second equivalent to one watt? Bernoulli equation derivation with examples and applications, Continuity equation derivation in fluid mechanics with applications, Newton’s law of universal gravitation formula, Newton’s First law of Motion Examples in Our Daily Life, Newton’s Second Law Definition and Formula, Newton’s Third Law of Motion Examples in Daily Life, Newton’s three laws of motion with examples and applications, Ampere’s law and its applications in daily life, Formula for ohm’s law with example and problems. Temperature So new resistance RN = ρ 2L/A/2 = 4. ρ.L/A =4R There are four factors on which resistance depends. The thermistor is a temperature-dependent resistor and its resistance decreases as temperature rises. What is the anothe name of unit joule/coulomb called, Differentiate between resistor and resistance. A parallel circuit is one more that has more than one branch. (a) The resistance of a conductor depends on thickness (cross sectional area of the wire), length and temperature. Participate in learning and knowledge sharing. The unit of ρ is ohm-meter (Ωm).Below given table of some metals with specific resistance: What are conductors? The resistivity of semi-conductors lies between that of conductors and insulators. As a result, the wire becomes thin due to stretching. The resistance of a wire depends both on the cross-sectional area and length of the wire and on the nature of the material of the wire. Conductivity and resistivity are inversely proportional. Hence, current cannot flow through an insulator because they are no free electrons for the flow of current. R = k* L/A Therefore, R = ρ(l  / A),ρ(rho) is constant of proportionality. What are some examples of Newton’s third law? Submitted to : Mr. Rajesh Kaurav Submitted by : Harsh Solanki [class- 12th ] 2. Recall that the reciprocal of resistance (1/R) is called conductance, which is symbolized by G.The unit of conductance is the Siemens (s). Define resistivity and state its SI unit. What are the factors on which resistance depend? 4. Generalised formula for calculating the resistance of any hat are the factors on which the resistance of a conductor depends? “One ohm (1Ω) of resistance exists if there is one ampere (1A) of current in a material when one volt (1V) is applied across the material.” What is conductance? All materials contain electrons. It depends on the intermolecular structure of the individual Resistance,R,is expressed in ohms and is symbolized by the Greek letter omega (Ω). List of Factors affecting resistance. They are tightly bound inside atoms. Offered for classes 6-12, LearnNext is a popular self-learning solution for students who strive for excellence. Factors on which Resistance depends. What is the time signature of the song Atin Cu Pung Singsing? When there is current through any material that has resistance, heat is produced by the collisions of free electrons and atoms. The resistance of an electric circuit can be measured numerically. Resistance of a conductor directly depends upon Length of the wire L There are two possible combinations of resistance in electric circuits: In series combinations, resistors are connected end to end and electric current has a single path through the circuit. There are two factors length of wire and area of cross section of wire. Gold, silver, copper, aluminum, and other metals are good examples of conductors. Copper wire has less resistance thin steel wire of the same size. The property of a material that restricts the flow of electrons is called resistance. Wher. The unit for resistivity is the ohm-metre. Each current path is called a branch. See Also: Types of electric charge What is the unit of resistance? Nature of material Give an example. It depends on the intermolecular structure of the individual material. Sample papers, board papers and exam tips. How much does does a 100 dollar roblox gift card get you in robhx? Resistivity is a measure of the resisting power of a specified material to the flow of an electric current per unit length and per unit of cross-sectional area at a specified temperature. The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size. resistivity of the conducter will not change with an increase in the length as it depends only on the nature of the conducter and temperature. See also: Difference between Voltage and current. resistance does not change with cange in lenght( only length, not for area of cross section), when its length is doubled resistivity decreases to its half. Resistivity is high in insulators where as very low in conductors. The total series resistance of a series circuit is equal to the sum of the resistance of each individual series resistor. The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size. A material or an object that conducts heat, electricity, light or sound is called conductors.Metal wires are good conductors of electricity and offer less resistance to the flow of current. What is the distance between the Earth and the Sun in km? R∝ 1/A . The thermistor is a temperature-dependent resistor and its resistance decreases as temperature rises. Resistence of a conducter depends on the length , nature ,width and type of material used . resistivity of a conductor depends on its length, area of cross section, temperature of exposure and metal used. Resistance decreases with an increase in temperature. Where, R is resistance, l is length, A is cross sectional area of conductor  and ρ is specific resistance or resistivity. What are the 4 factors that affect resistance? The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size. Resistivity of Conductors < Resistivity of Alloys < Resistivity of Insulators, Electric Potential and Potential Difference, Applications of Heating effect of Current. Save my name, email, and website in this browser for the next time I comment. The SI unit of electrical resistivity is the ohm⋅metre (Ω⋅m). The thermistor is used in a circuit that senses temperature change. Call our LearnNext Expert on 1800 419 1234 (tollfree) OR submit details below for a call back. If you are 13 years old when were you born? The formula is: The unit of conductance is the Siemens, abbreviated S.Foe example, the conductance of a 22KΩ resister is G=1/22KΩ=45.5µs. What is the rising action of faith love and dr lazaro? The current is the same through all points in the series circuit. The thermistor is a temperature-dependent resistor and its resistance decreases as temperature rises. The current through each resistor in a series circuit is the same as the current through all the resistors that are in series with it. So its area of cross section will be halved(Since the volume remains constant). 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. The resistance of conductors increases with an increase in temperature. Who is the longest reigning WWE Champion of all time? material is : Resistance = Potential difference/ Current. A good conductor has less resistivity, whereas a bad conductor or insulator has high resistivity. Hence the new resistance will become 4 times. When resistors are connected in series, the resistor values add because each resistor offers opposition to the current in the direct proportion to its resistance. Electrical resistance also depends on temperature. Insulators have a very large value of resistance.Glass,wood,plastic,fur,silk, etc. Call our LearnNext Expert on 1800 419 1234 (tollfree) OR submit details below for a call back. The internal resistance of a cell is directly proportional to the distance between the electrodes. Difference between conductors and insulators, resistance in paralell combination in circuit, resistance in series combination in circuit, Operational Amplifier (op-amp):types ,applications,modes & parameters.

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