Question

Consider the Kelvin Double Bridge. The resistor Q=2 . P=10k , R=20k S, A=100 92,B=2002, Rb=36 , rg=648. Eb=50V a) Calculate S when bridge is balanced. b) If the bridge is unbalanced such that 36 uA current flows through galvanometer, calculate the absolute and % error in Q R w G B 5 Q Eg .R

Answer 1

solution I consider the above given that R=20k P=loke M the resistor Q=22 M P=lo kr, R=20kh B= 2004 w A=loor y mi A=lool, B= 2004 ми d S 1-12 rg = 6482 Rb = 362 Eb=0V ㅜ R2 = 36h E 6=50V al bridge is balance then R Q S = alo R. р alo р (20x103) (2) lox 103 =hch 1: s=4h bl baridge is un balanced

PS 11 t BRb ATB + Rb R A B R (lox 103) 2 200 (36) + lox lot 20x103 loo 200 100+ 200+ 36 20x103 1+0=12 Absolute error = ar-lch =12 Pevecentage error in a : IR X100 ar Soy. y error in Q = 504. 1. /