http://www.physicsclassroom.com/class/circuits/Lesson-4/Series-Circuits
http://www.physicsclassroom.com/class/circuits/Lesson-4/Parallel-Circuits
http://www.school-for-champions.com/science/dc.htm#.VUhAgUJ4Xww
http://energy.gov/energysaver/articles/estimating-appliance-and-home-electronic-energy-use
http://whatis.techtarget.com/definition/voltage
http://www.physicsclassroom.com/calcpad/energy
http://www.physicsclassroom.com/class/circuits/Lesson-4/Parallel-Circuits
http://www.school-for-champions.com/science/dc.htm#.VUhAgUJ4Xww
http://energy.gov/energysaver/articles/estimating-appliance-and-home-electronic-energy-use
http://whatis.techtarget.com/definition/voltage
http://www.physicsclassroom.com/calcpad/energy