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- All About Circuits. http://www.allaboutcircuits.com/
- Lessons in Electric Circuits. http://www.ibiblio.org/obp/electricCircuits/
- Electric Circuit Concepts. http://hyperphysics.phy-astr.gsu.edu/Hbase/electric/ecircon.html
- Lessons in Electric Circuits. http://www.electriccircuits.net/