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<br />EXHIBIT A <br /> <br /> <br />. . ..-- .' <br />.. .~ Bottom c:antac:t . <br />... ," :~~u:m . <br />, . bottom of cell to top <br /> <br />How the power is used and stored <br /> <br />o Inverter changes DC current to AC so it can be used in applianc <br /> <br />I!I Unk to power utility's lines as a backup. Excess power can be sold <br />to the electric company and fed into its power lines, <br /> <br />o Battery stores power for use at night and on cloudy days <br /> <br />Source: U;S. Energy_Department National Renewable Energy Laboratory, "The Way Things Work~ <br /> <br />KNIGHT RIDDER <br /> <br />""~{,~L1j!..~"'~~Iti:\<.if;~wc~\:'''';,1<'''~'\~~lliJ.~;lI';<i~'''::' "'l~W:~"",,:.;,'iJi'.&~v,K_~~ <br /> <br />. <br /> <br />\ <br /> <br />" <br /> <br />. <br /> <br />,. <br />