A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of abridge circuit, one leg of which includes the unknown component. The primary benefit of a wheatstone bridge is its ability to provide extremely accurate measurements in contrast with something like a simple voltage divider.
Its operation is similar to the original potentiometer. The Whitestone bridge is the fundamental bridge, but there are other modifications that can be made to measure various kinds of resistances when the fundamental Wheatstone bridge is not suitable. Some of the modifications are:. In the figure, Save is the unknown resistance to be measured; Save , Save and Save are resistors of known resistance and the resistance of Save is adjustable.
If the ratio of the two resistances in the known leg Save is equal to the ratio of the two in the unknown leg Save , then the voltage between the two midpoints B and D will be zero and no current will flow through the galvanometer Save. If the bridge is unbalanced, the direction of the current indicates whether Save is too high or too low. Save is varied until there is no current through the galvanometer, which then reads zero. Detecting zero current with a galvanometer can be done to extremely high accuracy.
Therefore, if Save , Save and Save are known to high precision, then Save can be measured to high precision. The Wheatstone bridge uses the potentiometer whose sliding contact manipulates the resistance to be. The bridge is balanced by manipulating this contact until no potential difference is detected. At the. It follows that the since the uniform conducting material directly correlates to the length of the.
However, if a conductor shaped in a long. The apparatus for the Wheatstone bridge is a ten-turn potentiometer, a voltmeter, a standard decade. After we found the null. Data Table I Coil No. Coil No. The resistance of the wire appears to be proportional to the length of the wire and inversely proportional to the radius of the wire. The data consists of a slight error, but this could be from the use of a voltmeter as the determinate of the null point versus a galvanometer.
Additionally, there is always the possibility for human error and mechanical error in the apparatus. However, the data. This lab effectively showed how the Wheatstone bridge provides a mechanism to calculate an unknown resistance using the known relationships given through the resistivity correlation to length. It demonstrated how to set-up a Wheatstone bridge and how to manipulate a Wheatstone bridge in a laboratory setting.
In addition, the lab provided a demonstration of the aforementioned linear relationships. Although significant error existed in this lab, the results still reflect the relationships governing the Wheatstone bridge sufficiently for understanding in an experimental contextual environment.
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Explore Documents. This can be caused by an error when looking at the value on the rheostat measured by a ruler at the time of the lab. In this first experiment, the participant assembled the resistor in series, before looking for an unknown resistor value the practitioner must know the resistance value in R1. By looking at the color code, or by using multitester. When the power supply is turned on, the galvanometer needle will deviate, this means that there is an electric current flowing to the galvanometer because the working principle of the Wheatstone bridge is a balance, the galvanometer needle must be at zero by sliding the rheostat.
If it is at zero, this means that there are no more currents flowing in a state as said to be balanced. This experiment is in accordance with Ohm's Law I, Kirchof I which states in a closed circuit, the number of algebra GGL E and the number of potential decreases equal to zero.
In the second experiment using a 4. When compared with the resistor color that has been known the value is quite very far. In this second experiment, we are assembling a series in a parallel series and an unknown resistor value, an unknown value resistor when the circuit is larger than the paralleled circuit. Between the first experiment and the second experiment is actually the same, it's just that the resistor used is different in value.
This difference in the value of the resistor can be influenced by happiness factors such as incorrectly seeing the resistor's color ring and causing an error in its value. In this experiment, experiments have been conducted on Wheatstone bridges to find the value of the obstacles that are not yet known. Practically doing two repetitions, namely the first experiment R which has not known the obstacle is given with R1 which is Calculate the resistor resistance generated in steps 1, and 2!
Compare the resistor resistance produced! The bigger result is in the series in R1, meaning that the resistor color ring is very influential to determine the value of this Wheatstone bridge practicum. The Wheatstone bridge uses Kirchoff Law one and two where the currents at both ends are equal to produce a value of 0 on the galvanometer.
The Wheatstone bridge method is used to measure the obstacle method which is not yet known by multiplying it by crossing. The Wheatstone bridge can be used to find the value of an unknown value. The Rx value is greater when it is set to R1, because of the larger resistor value.
It is recommended that the practitioners prior to doing the practicum have to learn what they will practice in order to make the circuit correctly. It is expected that when doing a practicum, the practitioner must be more careful. Practically there must be mutual cooperation in this Wheatstone bridge practicum.
Jakarta: Erlangga Giancoli, DC
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