29-01-2013, 04:29 PM
COMPENSATION THEOREM
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THEORY :
Compensation Theorem: If the resistance of any branch of a network is changed from R to (R+ ∆R) where the current flowing originally is I, the change of current at any other place in the network may be calculated by assuming that an EMF of –I. ∆R has been injected into the modified branch while all other sources have their EMF suppressed and are represented by their internal resistances only.
PROCEDURE:
1. Connect the circuit as shown in figure1.
2. Apply 15V at R.P.S. and note down the currents I11, I21 & I31 by using the Ammeter.
3. Change the resistance value R to R +∆ R (i.e., R3 +∆ R) and connect the circuit diagram as shown in fig.2.
4. Apply voltage V (i.e., V= -I31. ∆ R) at R.P.S.
5. Note down the currents I111, I211 ,I311 using the Ammeter.
6. Now connect the circuit diagram as show in fig.3. and measure the currents I1 , I2 and I3.
7. Compare the currents. ( Take algebraic sum.)