Energy
- Page ID
- 35993
\( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\)
Energy is an illusive driving force of change and is a term coined by Thomas Young to broaden the concept of heat and work. Energy has many forms
- mechanical energy defined in Newtonian physics as potential and kinetic energy
unit: joule (J), 1 J = 1 N m - heat - energy in transition within a medium
unit: calorie (cal), 1 cal = 4.184 J. - electric energy - energy acquired by electric charge when accelerated by a voltage
units: J eV MeV GeV TeV amu etc - radiation (light and radioactivity)
- chemical energy
- energy carried by sound
- energy mass (nuclear energy)
- converts from one form to another at fixed rate.
For example: 1 cal = 4.184 J (a new definition of cal)
There is much to learn in energy conversion. - can neither be created nor destroyed - the law of conservation of energy .
- has many sources and forms
- is managed individually and collectively in a society
Contributors and Attributions
Chung (Peter) Chieh (Professor Emeritus, Chemistry @ University of Waterloo)