1. ZERO ENERGY HOUSES - (photovoltaic system ) By: Jonathan Tang ID#:20204433 4M-A

2. Photovoltaic. What is it System in zero energy homes that generates electricity Definition Direct conversion of light into electricity Converted at atomic level Principle absorb photons of light and release electrons. Capture of free electrons creates electricity

3. History. 1839 -first noticed by a French physicist, Edmund Bequerel 1905 -Albert Einstein described the nature of the photoelectric effect 1954 -first photovoltaic module built by Bell Laboratories 1960 -used seriously the first time by NASA

4. Why photovoltaic system?. $0 electricity bill - save money!! Environmentally friendly

5. Installation. Installed on the roof Set at south facing portion Reference: ww.subiacosustainable.com.au/ Gallery.cfm

6. How it works. DC to AC converter is needed for home system Reference: http://science.nasa.gov/headlines/y2002/solarcells.htm

7. $Cost$. 1960s - around $40,000 a watt of power Today - from $8 to $10 a watt - still expensive

8. Special Features. will generate electricity in most condition Designed to generate excess energy in summer for winter

9. THE END