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Transcript
Energy from the Sun Workshop Introduction to Photovoltaics Electricity Basics • • • • • • Electrical Current – how many electrons Voltage – how hard they’re pushed Power – what they can accomplish Circuit – where they can go Series Circuit – one pathway only Parallel Circuit – so many choices! Parallel vs. Series Circuits Parallel circuits • maintain potential (voltage is constant) • Current is divided among components • If one light goes out, the others stay lit Series circuits • maintain electrical flow (current is constant) • Voltage is divided among components • Easy to open circuit quickly DC vs. AC Direct Current • “Battery power” • Electronics use • Requires prohibitively high voltage to transmit over long distance Alternating Current • EASY to generate • Can be transformed in voltage • Can be limited while keeping voltage high • Can be transmitted over long distance without super-high voltage Photovoltaics PV Cell Conversion Efficiency PV Array Components oPV Cells oModules oArrays PV System Components Net Metering Net Metering Participation PV Array Fields Source: Solarbuzz, a part of The NPD Group • Clean • Sustainable • Free • Provide electricity to remote places Advantages of Solar Energy Disadvantages of Solar Energy • Less efficient and costly equipment • Part Time • Reliability Depends On Location • Environmental Impact of PV Cell Production Classroom Photovoltaics • Experiments help students understand the conditions needed for optimal power production • Focus of secondary-level solar curriculum • Use digital multimeters Using a Digital Multimeter DC Voltage Scale Resistance Scale. Do not use. Indicates voltage from alternating current. Do not use. DC Current Scale For More Information If you have questions, we have answers: • www.need.org – our website • [email protected] – questions about NEED • [email protected] – questions about this workshop • 1-800-875-5029 – NEED main office phone number
