EGEE - Lesson objectives: o Define Energy o Articulate...

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Lesson objectives: o Define Energy o Articulate fundamental forms of energy o Know the different units of energy o Define and distinguish differeneces between energy and power o Classify energy sources Energy: a property of matter that can be converted to work, heat or radiation o It can move thing or do work, produce heat even if it does not move anything, or be converted to light (radiation) 6 different basic forms of energy: o Mechanical Energy (Kinetic): energy that a body possesses by virtue of its motion Ex: a baseball player pitching a ball In the US we use about 1/3 of our total energy for transportation or movement of people and goods o Mechanical Energy (Potential): energy that a body possesses by virtue of its position relative to a reference point Ex: a pendulum, bow (archery), spring, etc. o Chemical Energy: energy locked in the bonds of molecules in the form of microscopic potential energy, which exists because of the electric magnetic forces of attraction exerted between the different parts of each molecule: It is the same attractive force involved in thermal vibrations The molecular parts get rearranged in the chemical reactions releasing or adding to this potential energy Examples: battery, burning wood, glucose in the body Approximately 85% of the energy used in the US comes from fossil fuels such as coal, oil and natural gas All of these fuels store energy in the form of chemical energy When they are burnt, these fuels release energry in the form of heat or thermal energy o Thermal or Heat Energy: energy that combines microscopic, kinetic and potential energy of the molecules Example: a hot beverage or boiling water Temperature is really a measure of how much thermal energry something has The higher the temperature the faster the molecules are moving around/vibrating; the more kinetic and potential energy the molecules have Fuels (chemical energry) are oftentimes burnt and converted to thermal or heat energy which is then converted to motion in an automobile or electricity
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o Electrical Energy: energy created through the movement of electrons among the atoms of matter Example: although electricity is seldom used directly, it is one of the most useful and most versatile forms of energy: When put into a toaster, it can be converted to heat, When put into a stereo, it can be converted into sound When put into an electric bulb, it converts into light, When put into a motor it converts into motion or movement
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This note was uploaded on 03/31/2008 for the course EGEE 102 taught by Professor Pisupati,sarmave during the Spring '07 term at Pennsylvania State University, University Park.

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EGEE - Lesson objectives: o Define Energy o Articulate...

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