12.2: Obtaining Energy Resources Difficulty Level: At Grade Created by: CK-12 CK-12 Earth Science Concepts For High School Natural Resources % Progress Practice Progress % Practice Now Read Practice Resources Details Loading... Vocabulary Language: English ▼ English Spanish energy efficiency energy efficiencyThe amount of useful work that is done by a unit of energy. net energy net energyThe amount of usable energy available from an energy resource. net-energy ratio net-energy ratioThe ratio between the useful energy present in a type of fuel, and the energy used to extract and process the fuel. Image Attributions Description Many factors go into determining how much energy a resource will provide. Learning Objectives None Difficulty Level: At Grade Authors: Dana Desonie, Ph.D. Tags: Energy Efficiency Net Energy net energy ratio (1 more) SCI.ESC.252.1.L.1 Subjects: science Earth Science Concept Nodes: SCI.ESC.252.1 (Obtaining Energy Resources) Grades: 9 , 10 Date Created: Feb 24, 2012 Last Modified: Jun 25, 2015 Vocabulary None You can only attach files to Modality which belong to you If you would like to associate files with this Modality, please make a copy first.