All transmission lines have a characteristic impedance which is different based on their length and voltage and frequency (for AC lines)(adsbygoogle = window.adsbygoogle || []).push({});

, Also all transformers and their primaries have a different impedance based on the turnsratio, core steel type etc factors.

Now I read that for any given line to supply the most of its capability with the highest efficiency the load impedance needs to be matched to the line impedance, or the load simply needs to be 100% resistive like a heater element or a large resistor, but most loads are not pure resistors, let's tale the typical mains transformer as an example.

Since mains transformers come in different sizes and specifications for different devices is it fair to say that some transformers utilize the line power more efficiently while others cause more reactive losses due to the mismatch in impedance between the transformer impedance and the line impedance and so deliver a worse power factor?

Thank you

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# Transmission line impedance etc

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