# nw

```VERIFICATION OF TELLEGEN’S THEOREM
Aim: - To verify Tellegen’s theorem.
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
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 &amp; 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.
```