Learning Goal: I’m working on a physics multi-part question and need the explanation and answer to help me learn.
A meter bridge is an electrical device that assists in calculating the value of a metal coil’s unknown resistance.
The Wheatstone Bridge’s basic design is the basis for Meter Bridge. An electrical network called a Wheatstone bridge is used to determine an unknown resistance’s value. According to the figure below, it contains four resistance connections.
Kirchhoff’s voltage law is used to calculate the Wheatstone network in the example above.
PQ=RS(1)
where P, Q, R, and S are the values of the four resistors’ assigned resistances.Galvanometer G in the diagram above.
A Wheatstone network may be built using meter bridges. The illustration below depicts a straightforward meter bridge R and S are variable resistors, G is a galvanometer, and D represents where the sliding contact will be when it is made to move along the AC line. Until the galvanometer reads zero, the sliding contact is moved. This demonstrates the balance of the Wheatstone bridge and enables us to use equation (1) to calculate the unknown resistances. The 1 Meter scale is used to hold the AC wire. A battery with emf E charges the entire circuit.
Let’s say that S is an unknown resistance whose value we must determine and that R is a known resistance.
RS=RADRDC
If AD=l
DC=(100l)cm then
We are aware that a material’s resistance is exactly proportional to its density. We are aware that a material’s resistance is inversely correlated with its length.
RS=l100l
We may determine the relationship between the resistances R and S by locating the balance point, and then we can compute the value of the unmeasured resistance.
We are aware that a material’s resistance is inversely correlated with its length.
RS=l100l
We may determine the relationship between the resistances R and S by locating the balance point, and then we can compute the value of the unmeasured resistance.
There is another bridge called the Carey Foster Bridge, which is a variation of the meter bridge, but there is no end resistance in the Carey Foster Bridge, whereas end resistance interferes with our readings in the meter bridge. The two bridges virtually resemble one another. When a diagram is provided, be cautious when selecting the bridge type.
