Wheatstone bridge, also known as the resistance bridge, is used to calculate the unknown resistance by balancing two legs of the bridge circuit, of which one leg includes the component of unknown resistance. Pdf simulation of wheatstone bridge for measurement of. The wheat stone bridge lab report free download as pdf file. This circuit avoids most of the difficulties of the ammetervoltmeter. The wheatstone bridge is used for measuring the very low resistance values precisely.
What is the conclusion for the wheatstone bridge experiment. The circuit is composed of two known resistors, one unknown resistor and one variable resistor connected in the form of a bridge. We can also measure the quantities capacitance, inductance and impedance using the variations on the wheatstone bridge. Under this special circumstance, the above circuit problem may be. A wheatstone bridge is a circuit used to measure the resistance of an unknown resistor. Wheatstone bridge circuit theory, example and applications. A laboratory version of the wheatstone bridge is shown schematically in figure 1. Experiment 4 potentiometers and the wheatstone bridge. Measurement of resistance using a wheatstone bridge objective various forms of the wheatstone bridge are used to accurately determine the value of an unknown resistance, capacitance or inductance. Name couple of sources of error in wheatstone brid.
Experiment we will use a slidewire wheatstone bridge, in which the two resistors r1 and r2 are two portions of a single, uniform nicr wire. For the most accurate measurement of resistance, the wheatstone bridge circuit is used. In this experiment, a wheatstone bridge will be used for the following purposes. Class 12th practical physics experiment of finding the specific resistance of a wire using meter bridge by anshu kapoor part i donate with paytm. The bridge circuit is built in simulation on computer environment and calculation of the unknown resistance per student is procured by monitoring the change on. Meter bridge specific resistance by anshu kapoorpart i. Below, the wheatstone bridge circuit will only be considered with respect to its application in strain gage technique. To measure resistance by means of the slide wire wheatstone bridge. Meter bridge physics pdf 29 download a363e5b4ee the wheat stone bridge lab report electrical resistance. Wheatstone bridge working principle, formula, derivation. It was invented by samuel hunter christie in the year 1833, which was later popularized by sir charles wheatstone in 1843.
A wheatstone bridge is used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown compound. Their resistor values are known values are given on the top of the resistor. Download this document for measuring techniques at hochschule bonnrheinsieg for free and find more useful study materials for your courses. It consists of a common source of electrical current such as a battery and a galvanometer or a multimeter that connects two parallel branches, containing four resistors, three of which are known. To check the specified tolerance of five 5% carbon resistors 2. In the wheatstone bridge we adjust the value of pot r3 until the. A resistance wire ab of uniform cross section, usually one meter in length, is mounted on a board with auxiliary components neces.
The wheatstone bridge circuit an example of a circuit that cannot be reduced using simple series and parallel rules appears the wheatstone bridge circuit above is usually operated by adjusting the variable resistor r3until no current flows in the ammeter. Wheatstone bridge resistor electrical resistance and conductance. The wheatstone bridge is an electrical bridge circuit used to measure resistance. We have shown that, when the bridge is balanced, any small change in rx will produce a vab proportional to that change. Researcher assistant will help how you can give l1 and l2 values. In 1843 the english physicist, sir charles wheatstone 18021875, found a bridge circuit for measuring electrical resistances. Wheatstone bridge along with operational amplifier is used to measure the physical parameters like temperature, strain, light, etc.