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Notes On Wheatstone Bridge

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Published in: Physics
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Kirchoff's laws and working of Wheatstone bridge

Fatima J / Hyderabad

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Qualification: M.Sc (vbs purvanchal university - 2017)

Teaches: Basic Computer, MS Office, School Level Computer, Computer Science, Mathematics, Physics, Statistics, Science, B.Sc Tuition, B.Tech Tuition

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  1. State Kirchoff's law for an electrical network. Using these laws deduce the condition for balance in Wheatstone bridge. Ans: Kirchoff's laws: Junction Rule Or Kirchoff's Current Law Or Kirchoff's First Law: At any junction in an electric circuit, the sum of currents entering the junction is equal to the sum of currents leaving the junction. Loop Rule Or Kirchoff's Voltage Law Or Kirchoff's Second Law: The algebraic sum of all P.D. 's in any closed circuit is zero. Wheatstone Bridge: 1. 2. 3. 4. It is an electric circuit used to compare resistances and to find the unknown resistance. It consists of four unknown resistances P, Q, R and S that are connected to form four sides of a parallelogram. Battery is connected between the junctions Galvanometer is connected between the junctions B & D. i 142 R D At D, for ig = 0, loop CBDC, Q c s i Balancing Condition: Applying KCL, At B, for ig = 0, applying KVL, loop ABDA, ilP - igG + i2R = O for ig = 0, i3Q + igG + i4S = O for ig = 0, i3Q = us i3Q ilP P Q ilP = i2R i2R R s from (1) & (2) This is the balancing condition for Wheatstone Bridge.

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