Electrical and Electronic measurements & instrumentation 10EE35 adjusting the variable resistance, r. After a steady balance has been obtained, inductive balance is obtained by using the A.C source and headphone. The condition for balance is that the potentials at the terminals D and E are same. Then the current flowing through branch AB is I1, through branch AE and EB is I2. The current flowing through branches AD and DC is I3, while that through branch BC is I1+I2. No current flows through branch DE. Circuit Details Consider the mesh ABCDA (1) This that potential drop along ABC is equal to that along ADC. Consider the mesh ABEA, there is no e.m.f. (2) Consider the mesh AEDA, (3) i.e. potential difference from A to E is equal to that from A to D. From (3) we get, (4) Now substitute the value of I3 from (1) in (4) (5) Dividing (5) by (2) 4. Page 21
Electrical and Electronic measurements & instrumentation 10EE35 adjusting the variable resistance, r. After a steady balance has been obtained, inductive balance is obtained by using the A.C source and headphone. The condition for balance is that the potentials at the terminals D and E are same. Then the current flowing through branch AB is I1, through branch AE and EB is I2. The current flowing through branches AD and DC is I3, while that through branch BC is I1+I2. No current flows through branch DE. Circuit Details Consider the mesh ABCDA (1) This that potential drop along ABC is equal to that along ADC. Consider the mesh ABEA, there is no e.m.f. (2) Consider the mesh AEDA, (3) i.e. potential difference from A to E is equal to that from A to D. From (3) we get, (4) Now substitute the value of I3 from (1) in (4) (5) Dividing (5) by (2) 4. Page 21