Contents
What is Wheatstone bridge equation?
Wheatstone Bridge Formula Following is the formula used for Wheatstone bridge: R=PSQ. Where, R is the unknown resistance. S is the standard arm of the bridge.
Why galvanometer is not used in AC bridge?
In AC bridge galvanometer is not used because the rotating torque is dependent on the average current that is passing through the coils of a galvanometer. Also, the average AC current passing through the AC bridge will be zero and there will not be any deflection.
Why galvanometer is not used as voltmeter?
A galvanometer as such cannot be used to measure the current in a circuit due to following reasons: (i) Galvanometer is quite a sensitive device. It shows full scale deflection with a current of few microampere, hence may get damaged if strong current is passed through it. Thus, measurement of current will not be true.
Can galvanometer detect AC current?
A galvanometer works by deflecting a pointer in response to an electric current flowing through a coil in a constant magnetic field. Today, the main type of galvanometer still in use is the D’Arsonval/Weston type.
What are the applications of the Wheatstone bridge?
This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Applications of Wheatstone Bridge”. 1. Wheatstone bridge is a __________ Explanation: The Wheatstone bridge is a d.c. bridge that is used for the measurement of medium resistance.
How is the unknown resistance of a Wheatstone bridge calculated?
Wheatstone bridge, also known as the resistance bridge, calculates the unknown resistance by balancing two legs of the bridge circuit. One leg includes the component of unknown resistance.
When is the current through the Wheatstone bridge zero?
Wheatstone Bridge Derivation The current enters the galvanometer and divides into two equal magnitude currents as I 1 and I 2. The following condition exists when the current through a galvanometer is zero, (1)
How are telephone faults located on the Wheatstone bridge?
Explanation: Cable faults in telephones can be located by telephone companies by making use of a Wheatstone bridge. Telephonic resistances are determined using suitable techniques. Dialtone is maintained through optical fibre technology.