Dictionary > Joule

Joule

The ‘joule is a derived SI unit of energy that was derived from the name of the English physicist, James Prescott Joule (the first to discover the first law of thermodynamics and proposed the mechanical theory of heat). It is a unit of electrical energy equal to the work done when a current of one ampere passes through a resistance of one ohm for one second. It may also be defined as the energy dissipated as heat as one ampere electric current passes through a resistance of one ohm for one second. A joule may also be the work required to produce 1 watt of power occurring for 1 second (Wattâ‹…second). One joule is roughly 0.001 btu. One calorie is about 4 joules. Symbol: J.

References

  1. McGraw-Hill Dictionary of Physics, Fifth Edition (1997). McGraw-Hill, Inc., p. 224.

© Biology Online. Content provided and moderated by Biology Online Editors



You will also like...

An artist depiction of a Precambrian multicellular life form.
The Evolution of Cell Organelles

The nucleus containing the genetic material, DNA, and the mitochondria, well-identified as the "powerhouse of the cell",..

Gibberellins and Gibberellic Acid
Gibberellins and Gibberellic Acid

This tutorial describes the role of gibberellin family in plants. Find out the effects of gibberellin on plant growth an..

genes controlling growth and development
Control of Growth & Development

Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..

Protein (illustration)
Protein Variety

The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..

dinosaurs
The Dinosaurs

Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..

Cambial cells
Plant Tissues

Plant organs are comprised of tissues working together for a common function. The different types of plant tissues are m..