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Maximum Power Transfer Calculator

Compute matched load R_L = R_th and max power P_max = V_th²/(4R_th).

Input Data

Input Thevenin voltage V_th.
V
Input Thevenin resistance R_th.
Ω

Results

50Ω
0.5W
R_L = R_th = 50.0000 Ω, P_max = V_th²/(4R_th) = 0.500000 W

At a glance:Maximum Power Transfer Calculator: enter parameters to compute results; complements related calculators.

Formula

R_L = R_th (match)

P_max = V_th² / (4 R_th)

How to Use

  1. Enter Thevenin voltage V_th.
  2. Enter Thevenin resistance R_th.
  3. Get matched load and max power.

Case Studies

V_th=10V, R_th=50Ω

R_L=50Ω, P_max=0.5 W.

FAQ

Efficiency?

At match the load gets max power but source efficiency is only 50%.

Related Tools

References

Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.

Found a problem with the results?

If this calculator's result is wrong, or you have any question about the calculation logic, please let us know. You are viewing:Maximum Power Transfer Calculator（/physics/max-power-transfer）。