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A measure of the overall effectiveness of a system. For example, in power conversion, it would be the ratio of output power to input power.

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What makes automotive alternators so inefficient relative to other applications?

I believe that a good part of the low efficiency can be attributed to the fact that the individual coils don't charge the battery until their voltage exceeds the battery voltage + 2 diode drops. … Such a low utilization of the coil would have to have a negative impact on the overall efficiency. That is unless an alternator is a constant-current source and not a constant-voltage source... …