How those little things convert mains AC to safe low voltage DC
http://www.howstuffworks.com/inside-transformer.htm
nickel-metal-hydride (NiMH) battery model accurately predicts the discharge characteristics of an NiMH cell (or groups of cells)
http://www.edn.com/archives/1995/020295/03di1.htm
http://www.opamplabs.com/zenerreg.htm
http://www.xtronics.com/batterap.htm
standard circuit for adjustable, 3-terminal regulators (LM317, LM350, etc) suffers from a designed-in fault: If the potentiometer R2s wiper loses contact, the regulators output goes high
http://www.edn.com/archives/1994/051294/10di6.htm
workings of lead-acid battery.
http://www.batterycouncil.org/works.html
Linear regulators convert unregulated dc voltage to regulated dc voltage. are good vehicles to use to begin a voltage-regulator study.
http://www.edn.com/article/CA178097.html
http://www.edn.com/article/CA149115.html