useful links

http://electrical-machinery.blogspot.in/2010/05/automatic-voltage-regulator.html
http://www.engineeringminiprojects.com/dc-motor-speed-direction-control-using-armarm7tdmi-processor-based-microcontrollerlpc2148/2011/
http://library.thinkquest.org/17531/hydro.html
http://www.qsl.net/ns8o/Induction_Generator.html

 http://101science.com/dsp.htm

 http://www.chem.mtu.edu/~tbco/cm416/PolesAndZeros.html

http://www.engineeringtoolbox.com/power-plant-efficiency-d_960.html

 http://www.tva.gov/power/coalart.htm

http://www.innovatia.com/

 http://dspguide.com/