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http://www.tina.com/English/tina/course/29power/power

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http://www.ee.ic.ac.uk/hp/staff/dmb/courses/ccts1/probsolall.pdf

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http://www.jaycar.com.au/images_uploaded/impmatch.pdf

http://www.allaboutcircuits.com/worksheets/trans2.html

http://openbookproject.net/electricCircuits/AC/AC_9.html

http://en.wikipedia.org/wiki/Electrical_resonance

http://openbookproject.net/electricCircuits/AC/AC_6.html

http://it.stlawu.edu/~jahncke/clj/cls/317/RLCResonance.pdf

http://www.indiabix.com/electrical-engineering/rlc-circuits-and-resonance/

http://www.ehow.com/video_4936276_electric-circuit-experiments-resonance-control.html

http://en.wikipedia.org/wiki/Maximum_power_theorem

http://unesco-nigeriatve.org/download/instructional_materials/nd%20electrical%20engineeing%20technology/Semesters/Semester%204/EEC%20249%20ELECTRICAL%20CIRCUITS%20(II)%20-%20Final-P/EEC%20249%20Theory.pdf

http://www.animations.physics.unsw.edu.au/jw/power.html

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http://hyperphysics.phy-astr.gsu.edu/hbase/electric/powfac.html

http://openbookproject.net/electricCircuits/AC/AC_11.html

http://upcommons.upc.edu/e-prints/bitstream/2117/2460/1/Power-factor_compensation.pdf

http://wiki.answers.com/Q/Is_low_power_factor_good_or_bad_to_the_power_company_or_consumer

http://voices.yahoo.com/electrical-theory-power-factor-5807676.html?cat=15

http://voices.yahoo.com/ac-circuits-apparent-power-true-power-5617712.html?cat=15

http://en.wikipedia.org/wiki/Volt-ampere_reactive

http://opencourseware.kfupm.edu.sa/colleges/ces/ee/ee201/files%5C3-Handouts_Lec_33_WFig_ver_01.pdf