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Wheatstone Bridge Circuit. By replacing R4 above with a resistance of known or unknown value in the sensing arm of the Wheatstone bridge corresponding to RX and adjusting the opposing resistor, R3 to “balance” the bridge network, will result in a zero voltage output. Then we can see that balance occurs when:
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Wheatstone bridge is an electrical circuit which is used to calculate unknown resistance. It was also used to calibrate measuring instruments such as voltmeters, ammeters, etc. It uses the concept of potential balancing using variable resistance. Samuel Hunter Christie originally invented it in 1833, but Sir Charles Wheatstone later developed it to...
Derivation, Equations & Formulas
In the diagram shown above let us consider that R1 and R2 are the known resistors, R3 is variable resistor and R4 is the unknown say RX. Now to create a wheat stone bridge condition, no current should pass through wire CD or potential at point C and D must be same. Let the currents in path ACB be i1 and in path ADB be i2. V1 is the potential drop in resistance R1, V2 is the potential drop in resistance R2, V3 is the potential drop in resistance R3 and VX is the potential drop in resistance RX...
The working of a Wheatstone bridge requires us to know the values of resistances of at least two resistors. We also need a rheostat and a galvanometer. The unknown resistance can be calculated using the known values and the reading of resistance of the variable resistance. Let in the diagram of a Wheatstone bridge, the unknown resistance be R2. And...
Maxwell bridge and Wein bridge are modifications of the original Wheatstone bridge which is used for calculations with reactive measurements and not just resistorsCarey foster bridge is another type of Wheatstone bridge and can measure very small resistances.Kelvin Bridge is also a type of Wheatstone bridge which is modified such that four-terminal resistance can be measured instead of the conventional two port resistors.Apr 2, 2024 · The circuit below shows a Wheatstone bridge where the unknown resistor is replaced with a strain gauge. Due to the external force, the resistance of the strain gauge changes and as a result, the bridge becomes unbalanced. The output voltage can be calibrated to display the changes in strain.
A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component. The primary benefit of the circuit is its ability to provide extremely accurate measurements (in contrast with something like a simple voltage divider ). [1]
Aug 31, 2023 · In a Wheatstone bridge configuration, strain gauges are connected in a balanced bridge circuit. The circuit has four resistive elements – two strain gauges and two precision resistors. When no strain is applied, the bridge circuit is balanced, with no output voltage.
It is used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component. Its operation is similar to the original potentiometer. Derivation: First, Kirchhoff's first rule is used to find the currents in junctions B and D:
The bridge’s state of balance is solely dependent on the ratios of R a /R b and R 1 /R 2, and is quite independent of the supply voltage (battery). To measure resistance with a Wheatstone bridge, an unknown resistance is connected in the place of R a or R b, while the other three resistors are precision devices of known value.
