A wheatstone bridge consists of four resistors that are connected in the shape of a diamond with the supply source and indicating instruments as shown in figure. The general arrangement of wheatstone bridge circuit is shown in the fig.
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The Given Wheatstone Bridge Is Showing No Deflection In The Galvanometer Joined Between The Points B And D In Fig
In a wheatstone bridge the deflection in the galvanometer does not change whenever the battery and galvanometer are interchanged.
Wheatstone bridge galvanometer deflection. In a wheatstone bridge if the battery and galvanometer are interchanged then what will be deflection in galvanometer. The wheatstone bridge is the interconnection of four resistances forming a bridge. There are two known resistors one variable resistor and one unknown resistor connected in bridge form as shown below.
By adjusting the variable resistor the current through the galvanometer is made zero. In normal condition the bridge remains in the unbalanced condition ie the current flow through the galvanometer. When the current through the galvanometer becomes zero the ratio of two known resistors is exactly equal to the ratio of adjusted value of variable resistance and the value of unknown.
Sensitivity of wheatstone bridge. With the help of a galvanometer in the bridge portion the null deflection in the galvanometer indicates. The sensitivity measured in ohms per volt is the inverse of the full scale deflection fsd current.
The sensitivity of a galvanometer or any meter for that matter is fixed and therefore the same in a wheatstone bridge as it would be in any other circuit. Wheatstone bridge is a network of resistors which is used to find the unknown resistance. Thus the deflection rate is the function of sensitivity.
The wheatstone bridge works on the principle of null deflection ie the ratio of their resistances are equal and no current flows through the galvanomete r. In the unbalanced condition of the bridge when current flows it causes the pointer of galvanometer to get deflected. This bridge is used to find the unknown resistance very precisely by comparing it with a known value of resistances.
The sensitivity of a wheatstone bridge is defined as the deflection in the galvanometer per unit current. A wheatstone bridge is used for the accurate measurement of resistance. The wheatstone bridge works on the principle of null deflection ie.
The ratio of their resistances are equal and no current flows through the galvanometer. The bridge is very reliable and gives an accurate result. The four resistance in circuit are referred as arms of bridge.
For measuring accurately any electrical resistance wheatstone bridge is widely used. The bridge is used for finding the value of an unknown resistance connected with two known resistor one variable resistor and a galvanometer.
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Figure A Below Shows A Wheat Stone Bridge In Which P Q R S Are Fixed Resistances G Is A Galvanometer And B Is A Battery For This Particular Case The Galvanometer Shows Zero Deflection Now
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