Here is a link to an interesting video on someone who work with electricity every day.
http://www.youtube.com/watch?v=2dqRN0Z7-_o&feature=related
1. Energy source - battery
2. CoWnductor - allows electricity to flow easily
3. Resistor - slows down the electric current
4. Insulator - stops the electric current
5. Switch - closes or opens the loop
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