![]() It would require very large generators merely to dissipate the heat developed. For example, power utilities, which generate many megawatts of electric power, do not operate under maximum power transfer, as then half of the power would be dissipated at the power plant, a very uneconomical, inefficient, and undesirable condition. When is maximum power transfer important and when is maximum efficiency important? The answer to these questions depends on the amount of power involved and the ease with which it can be generated. ![]() ![]() Which gives the efficiency as 50%, for matched conditions, as expected 100% efficiency is obtained for internal resistance R = 0 (a very powerful source), or for R L → ∞ (no power absorbed by load). (1.42) η = P load P source = i 2 R L iV = R L R + R L
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