# Free Resistivity Essays and Papers

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# Free Resistivity Essays and Papers

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Measuring the Resistivity of a Wire Aim The aim of this experiment is to find out how the area of the cross section of the wire affects the resistance and also to find out the resistivity of the wire having found the resistance over a certain length and using a certain cross sectional area. I will also experiment to see how the length of the wire affects the resistance. Plan The first thing that I will do is to set up the apparatus as shown below. A,V Except for the experiment

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Investigation Into the Resistivity of a Wire Aim: The aim of this investigation is to see how the length of Nichrome wire affects its resistance Pre-test Results: Wire Type Swags Length of Wire (cm) Voltage (v) Current (a) Resistance (â„¦) Constantan 26 10 20 40 13.5 27.5 56.4 0.4 37.5 687.5 1410 Copper 26 10 20 40 0.9 1.5 2.5 0.4 22.5 37.5 62.5 Nichrome 26 10 20 40 32

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will need to identify the factors that effect resistance. There are a few factors that affect the resistance, it is determined by the properties an object has. This is know as resistivity. The factors I can investigate are : Å¸ Temperature Å¸ Length Å¸ Cross-sectional area/width Å¸ Material (resistivity) The factor I shall investigate is the length of a wire. Background Knowledge Resistance is when electrons travelling through the wire are impeded by the atoms within the

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losses in the cable's metallic conductors. Temperature also has effects the resistivity of the conducting surface. Resistivity is a "bulk property of material describing how well that material inhibits current flow. This is slightly different from resistance, which is not a physical property. If one considers current flowing through a unit cube of material (say, a solid metal cube that measures 1 meter on each side), resistivity is defined as the voltage measured across the unit cube length (V/m) divided

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There are many problems that would require a geologist to solve ranging from erosion of the soil, volcanic activity, seismic faults, rocks and plate tectonics and why the continents are moving, sinkholes and many others. One current problem that I have witnessed and read about from multiple sources is about sinkholes. In the past few years there have been many occurrences where sinkholes are occurring and causing a huge amount of damage to the environment; and have also cause many casualties. Sinkholes

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Source - (Obtained in A-level PHYSICS by Roger Muncaster. Page 536.) The electrical resistivity of a material is defined by R= ÏL/A Where Â· R = Resistance of some conductor(Î©) Â· L = Length of the conductor(m) Â· A = Area of cross - section of the conductor (mÂ²) Â· Ï = the resistivity of the material of which the conductor is made (Î©m) The experimental determination of the resistivity of a material involves measuring the resistance of a specimen of the material. The specimen

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Investigating the Factors that Affect the Resistance of a Wire Aim To study the factors which affect the resistance of a wire. Background Information Although current and potential difference measure different things, they are related to each other. In 1826, Georg Ohm discovered that doubling the p.d. doubled the current. (Taken from Ohm's Law: the current flowing through a metal wire is proportional to the potential difference across it (providing the temperature is constant)

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alsowhich are occasionally used. Electrical resistivity quantifies how strongly a specific material opposes the flow of electric current. Electrical resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm⋅metre (Ω⋅m) although other units like ohm⋅centimetre (Ω⋅cm) are also in use. There are formulas to calculate electrical conductivity and resistivity. Conductivity is defined as the inverse of resistivity (a high conductivity means a low resistance)

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circuit determines the amount of current flowing in the circuit for any given voltage applied to the circuit. The resistance of an object is determined by the nature of the substance of which it is composed, its resistivity, accounting for its dimensions and its temperature. Resistivity is expressed in terms of Ohms / cm3 at 20ºC. An electrical conductor is any material that offers little resistance to the flow of an electric current. The difference between a conductor and an insulator, which is

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Factors Which Affect the Resistance of a Wire To start off this experiment I feel that it is suitable to explain the main facts of this study. Below is a section explaining the resistance in detail. Facts on Resistance: I have shown how resistance occurs. Â· WIRE Â· ATOMS Â· ELECTRONS Resistance occurs when the electrons traveling along the wire collide with the atoms of the wire. These collisions slow down the flow of electrons causing resistance. Resistance is a

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