The effects of mechanical stress on the electrical. Resistance is a force, which opposes the flow of an electric current around a circuit. First i will need to identify the factors that effect resistance. Dc resistance of a wire is determined by the wires shape e. The effects of mechanical stress on the electrical resistance of metals. Factors affecting the resistance of a wire the aim of this experiment is to investigate one factor that affect the resistance of a wire. In this experiment, you will examine the factors that affect the. Teaching the factors affecting resistance using pencil leads. Electrical resistance resistance r any device in a circuit which converts electrical energy into some other form impedes the current. The resistance of a given piece of wire or conductor depends on four factors. Factors effecting the resistivity of electrical materials. Insert your excel graph of the resistance yaxis versus the length xaxis here.
Excluding mineral deposits, it may vary from a few. Using a suitable conductor such as a copper wire, the following experiment will study whether the temperature of a wire will affect the flow of electrical current through a conductor. Electrical resistance shares some conceptual parallels with the notion of mechanical friction. The resistivity of the soil is the most important factor affecting the resistance of an electrode. Understanding these factors has useful applications in the construction of any electrical appliance, and in the design of the electrical wiring in our homes. One of those factors is the resistivity of the material that makes up the object. National electrical code nec in article 4 factors affecting the resistance of electrodes. Excluding mineral deposits, it may vary from a few hundred ohms to 106 ohms per cm cube, although. Temperature the resistivity of materials changes with temperature. Factors affecting electrical resistance completed lab. Data bulletin circuit breaker contact resistance testing. What factors can lower the electrical resistance of a wire. There are a few factors that affect the resistance, it is determined by the properties an object has.
Composition resistor mixture of carbon and insulating. Factors that influence electrical resistivity measurements in cementitious systems article pdf available in transportation research record journal of the transportation research board 2342. Teaching the factors affecting resistance using pencil. Electrical resistance is an important factor in understanding the dynamics of electricity, and this quiz and worksheet combination will test how youve grasped this concept. Factors on which the internal resistanceemf of a cell depends. Insert your excel graph of the resistance yaxis versus the length. Factors that influence electrical resistivity measurements in. Analysis on the factors affecting resistance of the earth electrode. The electrical resistivity of cementbased materials can be used in. Jul 27, 2018 factors effecting the resistivity of electrical materials are listed below temperature. The electrical resistance of a material is measured in.
Factors influencing electrical conductivity environmental. Pdf the notion of electrical resistance researchgate. Factors affecting the resistance electricity youtube. The electrical resistivity of soybean oil that had been purified to remove polar constituents was determined, and the effect of measuring conditions and the addition of polar constituents free fatty acids, phospholipids, monoglyceride. Extended experimental investigation electricity physics. Various factors that affect these elements and change motor performance will be discussed here by way of giving some specific examples. Change in resistance on changing dimensions of material formula. Pdf factors affecting mechanical properties of resistance. Standard test methods for dc resistance or conductance of. Various factors that affect these elements and change motor performance will be discussed here by. Resistance is a property of a device or a component. Looking at the entire time that they spend on the hill from when they start from rest at the top of the hill until they reach the bottom moving fast, indicate whether each of the following quantities is positive, negative, or zero, by writing either, or 0 for the questions below.
The factors affecting the conductance of electrolyte solutions temperature. When there is current in a conductive material, the free electrons move through the material and occasionally collide with atoms. Observations of factors that influence the measurements. Factors affecting the electrical resistivity of kraft. It aims to get them visualising the factors that effect resistance by drawing d. Electrical conductivity of earth materials is influenced by the metal content sulfides in the rock, porosity, clay content, permeability, and degree of pore saturation. Report sheet factors affecting electrical resistance lab 5 procedure part 1 effect of length length m current a resistance. Factors affecting the resistance of a conductor basic. For a wide range of materials, the resistance of a piece of material of length l. The nature of a material is not the only factor in resistance and conductance, however.
Electrical conduction in most metallic conductors not semiconductors. Factors affecting the electrical resistivity of soybean. Factors other than current that affect the severity of a shock are its path. This website beta version contains information on geophysical methods, references to geophysical citations, and a glossary of geophysical terms related to environmental applications. For pure metals at around room temperature, the resistivity depends linearly on temperature. Pdf factors that influence electrical resistivity measurements in.
But metals are not perfect conductors, otherwise the wires in our toasters would not get hot. Factors affecting motor performance motor performance depends on three elements such as voltage across terminals, resistance across terminals, and magnetic force. The strong electrolytes undergo complete ionization and hence show. Electrical resistance is defined as the property of an electrical component to resist the flow of electric current. He even came up with a rule for working out the resistance of a circuit. Analysis on the factors affecting resistance of the earth. Report sheet lab 5 factors affecting electrical resistance. Nature of the material resistance depends on the nature of the materi. Metals are generally excellent conductors of heat and electricity.
So resistance can be defined as the opposition to current caused by a. National electrical code nec in article 4factors affecting the resistance of electrodes. Factors that influence electrical resistivity measurements in cementitious systems article pdf available in transportation research record journal of the. The resistance of an object is affected by several factors. Hence dimensionwise resistance depends on length l and cross sectional area a of the material when we change dimension of a incompressible material, say length l, its area changes so that volume v remains constant. Gray, j henderson, j proceedings of the royal society of london 18541905. Factors affecting gas migration and contaminant redistribution in heterogeneous porous media subject to electrical resistance heating author links open overlay panel jonah l. Factors affecting motor performance products information. Ralph lery guerrero kevin roxas marco lauro delos santos 2. Four factors affecting resistance john vagabonds physics. Metals are good conductors so have lower resistance than an insulator of the same dimensions. The electrical resistivity of ash particles is an important parameter that determines the efficiency of electrostatic precipitators.
Jonny nelson explains resistance with a gcse physics practical experiment. The inverse quantity is electrical conductance, and is the ease with which an electric current passes. Factors affecting electrical resistance completed lab report. Factors affecting the electrical resistivity of kraft recovery boiler precipitator ash ivan sretenovic, masoumeh farkhondehkavaki, mark kortschot, and honghi tran abstract. A wide wire has less resistance than a narrow wire of the same material. Internal resistance internal resistance is defined as the resistance offered by the electrolyte of the cell to the flow of ions. The electrical resistance of a conductor is dependent on the following factors. Resistance is defined as an obstacle to the flow of electric current. Use of deionized, distilled, demineralized water can increase the electrical resistance in the measurement medium, which can alter the ph measurements. Factors effecting the resistivity of electrical materials are listed below temperature. Electrical resistivity measurements in cementitious systems.
The resistance of a conductor is directly proportional to its length l and inversely proportional to its crosssectional area a. Resistivity of most of the metals increase with temperature. Area of cross section resiatance r of conducter is inversely proportional to its area of cross section. Is the opposition offered by any object to the passage of an electric current through it. Electrical current transfers energy around circuits. The hydrothermal corrosion behavior of chemicalvapordeposited sic was investigated for application as nuclear fuel cladding in a pressurized water reactor pwr. Required practical investigate the factors that affect. Total gas pressure increases with increasing depth or decreasing pore throat size. The electrical resistivity of ash particles is an important parameter that determines the. The change in the resistivity of material with change in temperature is given by.
Resistance resistor purpose to control the amount of current flow by converting some of the electrical energy that flows through the circuit into heat. Use resistivity to calculate the resistance of specified configurations of material. Two types of resistors fixed resistor variable resistor or date. The unit of electrical resistance is ohm which is defined as volt per ampere. Experimental investigation of factors affecting the. Dec 29, 2014 the aim of this paper is to provide a way of teaching the factors that affect resistance using mechanical pencil leads and the brightness of the light given out by a light bulb connected to an electrical circuit. A worksheet created for low ability, eal students in preparation for igcse. Metal content all metal objects of interest in contaminated site assessments have a very large conductivity contrast with their surroundings and can usually be readily. Electric circuit a source of electric power a battery or an ac source, load and switches and other elements connected together by wires form.
Understanding the standards and test results evaluating test results variable factors affecting circuit breaker pole resistance include. For reproducible resistivity measurements, voltages in. Feb 27, 2017 the resistance of a given conductor depends on. Electrical resistance definition, unit, formula, measurement. George ohm discovered that a circuit sometimes resists the flow of electricity. Because of this, we tend to neglect any resistance in wires when we examine the behavior of ordinary loads bulbs, resistors, motors, etc. Factors affecting mechanical properties of resistance spot. Article information, pdf download for factors that influence electrical. Which of the following factors influence the electrical resistance of a circuit. Factors that affect resistance in an electrical circuit.
This paper presented the effect of grain size, stacking fault, electrical conductivity, and electrochemical properties on the hydrothermal corrosion behavior of the cvd sic in a. In electronics and electromagnetism, the electrical resistance of an object is a measure of its opposition to the flow of electric current. Factors affecting the resistance of a wire introduction. The device which converts electrical energy to heat energy is termed a resistor and its ability to impede current is termed resistance. This paper presents the first results of an experimental investigation using the facility to study the main influencing factors affecting the electrical contact resistance for the stub to carbon connection, which is one of the major electrical connection resistances found in aluminium smelting plants. Which of the following factors influence the electrical. Factors affecting the hydrothermal corrosion behavior of. The conductance of an electrolyte solution increases with increase in the temperature due to increase in the extent of inonization. Factors affecting the electrical resistivity of soybean oil. Analysis on the factors affecting resistance of the earth electrode written by ms.
Example coboiling temperatures, calculated using eqs. There are four factors affecting resistance which are temperature, length of wire, area of the crosssection of wire and nature of the material. Introduction the problem i am investigating is the effect of temperature on conductivity and resistance. The present paper addresses the factors governing the mechanical performance of low carbon resistance spot welds. Jan 16, 2018 this video features about factors affecting resistance like resistivity and many others foc cbse board exams for class x. For example, common resistance elements in a circuit are lights, motors, and electrical resistance heaters. When we change dimension of a incompressible material, say length l, its area changes so that volume v remains constant. In general, for metallic wire, the higher the temperature, the larger its resistance. If resistance is low, the electrical charge is allowed to freely move through the substance. Correlations among the process parameters welding current, welding time. Length resistance r is directly proporation to its length. Factors affecting electrical resistance free essays. The resistance of an object depends in large part on the material it is made of. In electronics and electromagnetism, the electrical resistance of an object is a measure of its.
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