2.5 Practical DC Voltage Sources
Batteries
Batteries are the most common dc source. They are made in a variety of
shapes, sizes, and ratings, from miniaturized button batteries capable of
delivering only a few microamps to large automotive batteries capable of
delivering hundreds of amps. Common sizes are the AAA, AA, C, and D as
illustrated in the various photos of this chapter. All batteries use unlike conductive
electrodes immersed in an electrolyte. Chemical interaction between
the electrodes and the electrolyte creates the voltage of the battery