How to write the experimental report of the Wheatstone bridge?

Wheatstone bridge resistance measurement.

The bridge is a basic electromagnetism measuring instrument that uses the comparative method to measure physical quantities, and there are many types of bridges, and the resistance of measuring medium resistance (10 106 ohms) should be measured with Wheatstone single-arm bridge; If you want to measure the resistance of a larger resistance, a high-resistance bridge or megohmmeter is generally used; To measure resistance with a small resistance, a double-arm bridge (Kelvin bridge) is generally used. The bridge has high accuracy and stability, so it is widely used in electromagnetic measurement, automatic adjustment and automatic control. The Wheatstone single-arm bridge is the most basic DC single-arm bridge.

The specific report can be found here.

Summary. Source: When g passes through without current, the bridge is said to be balanced.

In equilibrium, the resistance of the four arms satisfies a simple relationship that can be used to measure the resistance. Wheatstone bridge is a bridge circuit composed of four resistors, these four resistors are called the bridge arm of the bridge, Wheatstone bridge uses the change of resistance to measure the change of physical quantity, the single-chip microcomputer collects the voltage at both ends of the variable resistance and then processes, you can calculate the change of the corresponding physical quantity, which is a very high precision measurement method. The unbalanced bridge is generally used to measure the slight change of the resistance value, such as the resistance strain gauge (the resistance wire is made into a grid and pasted between two layers of tissue paper or plastic film) is cemented on the object, when the object is deformed, the strain gauge is also deformed, the resistance of the strain gauge changes from Rx when the bridge is balanced to Rx+ Or, then the current Ig through the galvanometer will also change, and then 0R can be measured according to the relationship between Ig and 4R, and then the deformation of the object is calculated by the relationship between R and the solid deformation.

Hello dear! We are happy to answer for you, but the conclusion of the Wheatstone Bridge experiment is regret: "The Wheatstone Bridge (also known as a single-arm bridge) is an instrument that can accurately measure resistance.

The Wheatstone bridge resistors R1, R2, R3, R4 are called the four arms of the bridge, and G is the galvanometer to check whether there is a current in the branch where it is located.

Facts: When g no current passes through this eggplant, the bridge is said to be balanced. In equilibrium, the resistance of the four arms satisfies a simple relationship that can be used to measure the resistance.

Wheatstone bridge is a bridge circuit composed of four resistors, these four resistors are called the bridge arm of the bridge, Wheatstone bridge uses the change of resistance to measure the change of physical quantity, the single-chip microcomputer collects the voltage at both ends of the variable resistance and then analyzes the stupid post-processing, you can calculate the change of the corresponding physical quantity, which is a kind of measurement method with high precision. The unbalanced bridge is generally used to measure the slight change of the resistance value, such as the resistance strain gauge (the resistance wire is made into a grid and pasted between two layers of tissue paper or plastic film) on the object, when the object is deformed, the strain gauge is also deformed, the resistance of the strain gauge changes from Rx when the bridge is balanced to Rx+ Or, then the current Ig passed by the galvanometer will also change, and then 0R can be measured according to the relationship between IG and 4R, and then by The relationship between r and the deformation of the solid is calculated by the deformation of the object.

What can this experiment tell us?

What can be used for it.

Kiss! The resistances of the opposite arm are multiplied, and if the values are equal, the bridge is balanced. The current on the bridge is zero at equilibrium.

It can be used to make an instrument that can accurately measure resistance and measure current. The universal Wheatstone Interrupter Bridge with resistors R1, R2, R3, R4 is called the four arms of the bridge, and G is a galvanometer to check whether there is a current in the branch where it is located.