El puente de Wheatstone deriva su nombre del físico inglés Sir En un circuito puente, la disposición de las resistencias que lo caracterizan. Un Kelvin puente, también llamado puente de Kelvin doble y en algunos países Puente de Para medir tales resistencias, se requiere un circuito de puente diseñado para trabajar con resistencias de La operación del puente de Kelvin es muy similar al puente de Wheatstone, pero utiliza dos resistores adicionales. Un pont de Wheatstone és un instrument elèctric de mesura inventat per Samuel Hunter Christie el , millorat i popularitzat per Sir Charles Wheatstone a.
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Pont de Wheatstone
First, Kirchhoff’s first law is used to find the currents in junctions B and D:. A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuitone leg of which includes the unknown component.
To do so, one has to work out the voltage from each potential divider and subtract one from the other. Electrical meters Bridge circuits Measuring instruments English inventions Impedance measurements. Accelerometer Angular rate sensor Auxanometer Capacitive displacement sensor Capacitive sensing Gravimeter Inclinometer Integrated circuit piezoelectric sensor Laser rangefinder Laser surface velocimeter Lidar Linear encoder Linear variable differential transformer Liquid capacitive inclinometers Odometer Photoelectric sensor Piezoelectric accelerometer Position sensor Rotary encoder Rotary variable differential transformer Selsyn Sudden Motion Sensor Tachometer Tilt sensor Ultrasonic thickness gauge Variable reluctance sensor Velocity receiver.
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Geophone Hydrophone Microphone Seismometer. One of the Wheatstone bridge’s initial uses was for the purpose of soils analysis and comparison. In other projects Wikimedia Commons. In many cases, the significance of measuring the unknown resistance is related to measuring the impact of some physical phenomenon such as force, temperature, pressure, etc.
This page was last edited on 8 Novemberat Retrieved from ” https: The Kelvin bridge was specially adapted from the Wheatstone bridge for measuring very low resistances. The desired value of R wheatstoen is now known to be given as:. Detecting zero current with a galvanometer can be done to extremely high precision.
At this point, the voltage between the crcuito midpoints B and D will be zero.
From Wikipedia, the free encyclopedia. The equations whetastone this are:. Published in “Engineering Science and Education Journal”, volume 10, no 1, Februarypages 37— On the other hand, if the resistance of the galvanometer is high enough that I G is negligible, it is possible to compute R x from the three other resistor values and the supply voltage V Sor the supply voltage from all four resistor values.
Variations on the Wheatstone bridge can be used to measure capacitanceinductanceimpedance and other quantities, such as the amount of combustible gases in a sample, with an explosimeter. Breathalyzer Carbon dioxide sensor Carbon monoxide detector Catalytic bead sensor Chemical field-effect transistor Electrochemical gas sensor Electrolyte—insulator—semiconductor sensor Electronic nose Fluorescent chloride sensors Holographic sensor Hydrocarbon dew point analyzer Hydrogen sensor Hydrogen sulfide sensor Infrared point sensor Ion selective electrode Microwave chemistry sensor Nitrogen oxide sensor Nondispersive infrared sensor Olfactometer Optode Oxygen sensor Pellistor pH glass electrode Potentiometric sensor Redox electrode Smoke detector Zinc oxide nanorod sensor.
Views Read Edit View history. This setup is frequently used in strain puebte and resistance thermometer measurements, as it is usually faster to read a voltage level off a meter than to adjust a resistance to zero the voltage.
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The Wheatstone bridge illustrates the concept of a difference measurement, which can be extremely accurate. The Wheatstone bridge is the fundamental bridge, but there cirfuito other modifications that can be made to measure various kinds of resistances when the fundamental Wheatstone bridge is not suitable. Diode bridge H bridge. Schering Bridge Wien bridge.