Experiment 3 phy 156 | dr alexander zaitsev page | 1 resistivity objective objective of this lab work is to measure resistivity of a conductor with uniform cross-section over its length physical principles when voltage v is applied between the ends of a conductor, a current i flows through this conductor the current. Take a one metre length of constantan wire and connect it to a variable voltage power supply, voltmeter and ammeter vary the voltage applied to the wire and take a set of readings of current and voltage keep the current below 05 a throughout plot a graph of these readings the experiment should show you that there is. 100 student id: date of experiment: date of submission: experiment no 4: verifying ohm's law and measuring specific resistance (resistivity) objectives: 1 measuring the voltage and the current on four constantan wires with different cross-sectional areas 2 measuring the voltage and the current on two constantan. I determine the resistivity of constantan and compare it to a data book value. Employed in experiment 2em, it is not widely used for the following reasons: (1) to measure a wide variety of a laboratory version of the wheatstone bridge is shown schematically in figure 1 a resistance wire ab of uniform cross section, usually one meter in length, is mounted on a board with auxiliary components neces.
Goal of experiment this experiment verifies the dependence of wire resistance on its parameters (length, cross section) and conductor material this experiment also involves a problem bad conductors are eg kanthal, constantan, carbon and others the unit of electrical resistivity is derived from the. This is a virtual experiment allows the user to measure the resistivity of constantan the micrometer is used to measure the diameter of the constantan wire the crocodile clip can be moved to change the effective length of the wire the voltage on the power supply can be changed to keep the current at about the same value. Your simulator will consist of a metre bridge kept on a table, battery, resistance box and wires on the side bar menu click on the battery and the resistance box shown on the side bar menu to place them near to the metre bridge drag one of the wires to the right gap of the metre bridge now the button, “start experiment” will. Experiment to measure the resistivity of a wire equipment: 1m of constantan wire of diameter 027 and 056 mm 1m of nichrome wire of diameter 027 and 056 mm 12 v supply, 2 multimeters.
To help me plan my investigation i have completed a preliminary experiment in which i investigated the effect of the thickness of a wire on its resistance, using three constantan wires and one copper wire i found that the resistance increased as the thickness of the wire decreased, however, when i did the test with the copper. Principle the resistance of a short thick wire is different to that of a long thin one tasks examine how the value of the resistance of a wire depends on its length and cross-sectional area.
(a) of what material is a wire made, if it is 250 m long with a 0100 mm diameter and has a resistance of 777 ω at 200ºc (b) what is its resistance at 150ºc 11 assuming a constant temperature coefficient of resistivity, what is the maximum percent decrease in the resistance of a constantan wire starting at 200ºc 12. An experiment to find the resistivity of a wire in this experiment, i am going to find out the relationship between resistivity, resisistance, cross sectional area and length of the wire, which in this case is constantan so i can find the resisitivity of constantan resistivity of a wire is the property of the wire,. A wire's resistance depends on four main factors: resistivity length of the wire cross-sectional area temperature of the wire i will investigate how the length of the wire affects the resistance i have done a preliminary experiment to help me decide the best way to do my investigation the results will help.