Exp 4

Electric lab

: Objective To learn using the new method to solve the -1 .complex circuit .This method a-thevenin equivalent -2 . b-Norton equivalent circuit . Measure the maximum power transfer -3 To learn use the decade -4 . resistor box Using the pspice program until paint the circuit -5 .and works the simulate : Theory : thevenin equivalent-1 Vth =Vo.c (measure about method mesh ( Or nodal Rth = Req (whine put place the power .( Supply short circuit VL

Vth* =

: Norton equivalent circuit -2 IN=Is.c (measure about method .( Loop mesh Rth = Req

Electric lab

= IL : maximum power transfer-3 Rth=Req=RL Vth=Vo.c Pmax =Vth2/4Rth=Rn*In2/4 (Vo.c/2(*(Is.c/2(= ;( Result and digrams (data of table :Table 1 Equivalent voltage

Equivalent resistance

(V(

(Ω (

Equivalent (current(Isc (mA(

measure d

calculate d

measured

calculated

measure d

calculat ed

:Table 2 Load voltage

Load current

(V(

(A(

Measured

Calculated

Measured

Calculated

:Table 3 Equivalent (current(Isc (A ( measur ed

Equivalent resistance (Ω(

calculate d

measure d

calculat ed

Load voltage (V( measur ed

Load current (A(

calculat ed

measur ed

calculat ed

Electric lab

:Table 3 decade (resistance(Ω

(Load voltage (V

(Load current (mA

100 200 300 400 500 600 700 1k 1.5k 2k 2.1k 2.2K 2.3k 2.4k 2.5k

:Calculation : Using nodal 0+

=

Vth=18.71v : using loop 6.8k *I1( +(1k*I1(-(1k*I2(-20=0( +10 (7.8k*I1 -1k*I2 =10………..(1

(Load power (mW

Electric lab

(1k*I1(+(1k*I2(=0…………(2(-20 (Equation (1(+(2 I1=-10/6.8k =-1.47mA I2=1k*-1.47mA-20=-21.47mA Calculate the Rth Rth =Req=(6.8k*1k(/(6.8k+1k( =871 Ω Pmax=Vth2/4Rth Pmax=18.712/4*871 mW 100=

: Question Plot the power delivered to the load versus the load(1 resistance RL .whate is the value of Rload that draws the ? maximum power from the source 89 .3

Electric lab

exist large differences because the connecting (2 . to loss the voltage in the earth

: Conclusion the method of Norton is similar tom the method -1 .of thevenin thevenin theorem is an important tool in the-2 . solution of complex networks the equivalent circuit consist of an independent-3 . voltage source calculate the maximum power transfer whine Rth -4 . equal RL only