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Maximum Power Transfer Theorem

  Procedure:

  1. Apply Supply voltage (Vin = 230v, f = 50Hz) and Choose weather to connect or bypass LS and CS by clicking on the corresponding white check box. (By default they are all connected. 'Tick sign' indicates, the component is bypassed.)

  2. Now set the values of different elements of source impedance(ZS) then switch on circuit board to get the voltmeter readings.

  3. Case-1 (Only XL is adjustable) Choose weather to connect or bypass LL and CL. Adjust them and click on simulate to set XS=−XL. Check if the power transferred to Load(PL) is maximum and check the corresponding efficiency.

  4. Case-2 (Only RL is adjustable) Adjust RL and click on simulate to set Ra=RL. Where; Ra=√R2s+(Xs+Xl)2. Check if the power transferred to Load(PL) is maximum and check the corresponding efficiency.

  5. Case-3 (Both XL and RL are adjustable) Choose weather to connect or bypass LL and CL. Adjust RL and XL and click on simulate to set Rs=RL and Xs=−XL. Check if the power transferred to Load(PL) is maximum and check the corresponding efficiency.

    6. N.B.: Switch off the supply any time to modify different components of the circuit.
  • When only XL is adjustable:
      Switch on the ckt board, adjust XL and click on simulate to set XS=−XL.

      Current XS =        and XL =
      Current power transferred to Load (PL) = Watt
      and efficiency (Pt/Pl) = %

    Ω

    Ω

  • When only RL is adjustable:
      Switch on the ckt board, adjust RL and click on simulate to set Ra=RL.
      where, Ra=√R2s+(Xs+Xl)2
      Current Ra =        and RL =
      Current power transferred to Load (PL) = Watt
      and efficiency (Pt/Pl) = %

    Ω

    Ω

  • When both XL and RL are adjustable:
      Switch on the ckt board, adjust both RL and XL and click on simulate to set Rs=RL
      and Xs=−XL.   Current Rs =        and RL =
      Current Xs =        and XL =
      Current power transferred to Load (PL) = Watt
      and efficiency (Pt/Pl) = %

    Ω

    Ω

    Ω

    Ω

Tutorials Point

V

V

V

V

V

V

Ω

Ω

F

F

H

H

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