These two words both seem to mean "efficiency", but is there any difference in
their meaning and usage?

From reading around a bit, I have gathered this. Is this correct? Could
someone please explain it more clearly?

  * 能率 Time efficiency (e.g., He spent the time efficiently)
  * 効率 Usage efficiency (e.g. This machine is very energy efficient)
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2014-06-14T09:07:53.353
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2014-06-14T17:18:20.770
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question
word-choice usage
What's the difference between these two words for "efficiency"? 能率/効率
Your general impression is correct.

The first term (能率, nōritsu) generally applies to how much can be gained with
in a set time period. It is used more abstractly and generally, often to refer
to an improvement in performance of a task at work, as in statements like
"using a computer is more efficient".

Also, this term is used in physics to refer to a moment, although in the
material I've seen on that topic, モーメント (mōmento) is more common.

The second term (効率, kōritsu) more often applies to the operational efficiency
or effectiveness of machinery or equipment, or to the amount gain or benefit
obtained with respect to effort applied. In concrete terms, 効率 tends to be
used to describe the performance of various types of machinery or equipment as
regards, for instance, energy efficiency, power consumption, or output.

The second term (効率) is widely used in technical literature, research papers
on topics such as electrical engineering, power electronics, and mechanical
engineering, and anywhere that the performance or a device or apparatus is
being measured and evaluated.
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2014-06-14T15:11:00.230
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answer