VERIFICATION OF TELLEGEN’S THEOREM Aim: - To verify Tellegen’s theorem. Apparatus Required:Bread board Ammeter’s :(0-10mA) MC –1 No. Regulated power supply (0-30V) Resistors: 2.2K -3No. 3.3 K -1No. 1K -1No. . CIRCUIT DIAGRAM: Theory: Procedure: 1) Make the connections as per the circuit shown in fig. 2) Switch on the supply, apply Vs=10V by varying regulated power supply and note down reading of load current (IL ),V1,V2&V3 in table. 3) Repeat step-2 for Vs=15V and Vs=20V. 4) Calculate the algebraic sum of powers in all three branches. Calculations: Applied voltage Vs=10V Total resistance in the circuit Req=5.4KΩ Current in the circuit I= Vs R =1.85mA eq G.PULLAIAH COLLEGE OF ENGINEERING & TECHNOLOGY, KURNOOL Voltage drop in 2.2KΩ, V1=4.07V Voltage drop in 2.2KΩ, V2=4.07V Voltage drop in 1KΩ, V3=1.85V sum of the powers in all three branches, 3 Vki K =v1i1 v i2 2 v i3 3 vsi =7.53+7.53+3.42-18.5=0 Watt s k 1 Observation Table: S.No. Vs(volts) 1 2 3 15 20 10 IL(mA) V1(volts) V2(volts) V3(volts) Result: Thus the Tellegen’s theorem is verified theoretically and practically.