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Mechanical Efficiency of Real Machines

The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
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Related Experiment Video

Updated: May 8, 2026

Measuring Sperm Guidance and Motility within the Caenorhabditis elegans Hermaphrodite Reproductive Tract
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Published on: June 6, 2019

George A. Miller (1920-2012).

Steven Pinker1

  • 1Harvard University.

The American Psychologist
|September 11, 2013
PubMed
Summary
This summary is machine-generated.

George A. Miller, a pivotal figure in 20th-century psychology, pioneered cognitive psychology and psycholinguistics. His seminal work, "The Magical Number Seven," profoundly influenced cognitive science and information processing theories.

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Published on: January 21, 2014

Area of Science:

  • Cognitive Psychology
  • Psycholinguistics
  • History of Psychology

Background:

  • George A. Miller (1920-2012) was a highly influential psychologist of the 20th century.
  • His 1956 paper, "The Magical Number Seven, Plus or Minus Two," is a landmark in cognitive psychology.
  • Miller was instrumental in initiating the cognitive revolution in psychology.

Discussion:

  • He integrated concepts from information theory, communication, grammar, semantics, and artificial intelligence into psychological research.
  • Miller's work demonstrated that rigorous scientific inquiry could be communicated with clarity and engaging prose.
  • His contributions laid the foundation for modern cognitive science and the study of human information processing.

Key Insights:

  • Miller's research on the limits of human information processing capacity, famously summarized as "The Magical Number Seven, Plus or Minus Two," remains a cornerstone of cognitive psychology.
  • He established psycholinguistics as a distinct field, bridging psychology and linguistics.
  • His interdisciplinary approach significantly advanced the understanding of the mind and its processes.

Outlook:

  • Miller's legacy continues to inspire research in cognitive science, artificial intelligence, and the study of language.
  • His emphasis on clear scientific communication serves as a model for researchers across disciplines.
  • The fields he pioneered, cognitive psychology and psycholinguistics, remain vibrant areas of scientific inquiry.