A battery operated flashlight is turned on. What energy transformations take place and how does the amount of energy in the batteries compare to the total amount of light given?

Hopefully the following sites will help you understand the principles of flashlights:

http://www.energyquest.ca.gov/story/chapter04.html

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http://www.americanheritage.com/articles/magazine/it/2007/4/2007_4_4_print.shtml

http://electronics.howstuffworks.com/battery.htm

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