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# Renewable Energy Electricity &amp; Physics Basics

Renewable Energy Electricity &amp; Physics Basics. Frank R. Leslie, B. S. E. E., M. S. Space Technology 1/24/2005, Rev. 1.0 fleslie @fit.edu; (321) 674-7377 www.fit.edu/~fleslie. Introduction. Some students interested in renewable energy may not have had electricity and/or physics courses

## Renewable Energy Electricity &amp; Physics Basics

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1. Renewable Energy Electricity & Physics Basics Frank R. Leslie, B. S. E. E., M. S. Space Technology 1/24/2005, Rev. 1.0 fleslie @fit.edu; (321) 674-7377 www.fit.edu/~fleslie

2. Introduction • Some students interested in renewable energy may not have had electricity and/or physics courses • This course requires some knowledge of these subjects, but only the basics, which I provide here • Electricity requires concepts of voltage, current, resistance, and power • Physics requires concepts of force, pressure, leverage, torque, and power 050124

3. 1.1.0 Electricity: Introduction

4. 1.1.3 Electricity: Safety • With voltages exceeding some 50 volts, there is potentially a shock hazard that could lead to heart irregularities and death! • With low voltages but potentially high currents, you could be burned by hot wires or arcing. This arc could cause temporary blinding. • Preclude shorting of wires, especially from large battery systems. 050124

5. 1.2.Physics: Force 050124

6. 1.2.Physics: Torsion 050124

7. 1.2.Physics: Power 050124

8. 1.2.Physics: Energy 050124

9. 1.2.Physics: Light 050124

10. 1.2.Physics: Pulleys & Gears • Mechanical shafts may be coupled together by pulleys and belts or directly by gears 050124

11. 1.2.Physics: Safety • Hazards of pinching or crushing from strong forces may exist! • Use eye protection if flying parts might spin off breaking machinery • Wear eye protection when working with batteries to avoid acid splashes • Take care to keep hair and jewelry out of rotating or moving parts • Plan what will happen if something explodes or shatters or otherwise goes horribly wrong! [news cliché] 050124

12. 1.3.1 Units • Voltage, V in volts, for voltage drops across a load • Electromotive force, E in volts, source voltage from battery, etc. • Current, I in amperes or amps, flow of electrical charge • Power, P in watts, ability to do work • Energy, sometimes E or script E in watt-hours, work done • Note: capital for direct current and lower case for alternating current • Force, F in newtons or pounds force, for push or pull • Torque, T in newton-meters or pound-feet, for twisting or torsion 050124

13. 1.3.2 Equations • E = IR = sqrt(P/R) FIX THIS • I = E/R = sqrt(P FIX THIS • P = EI = E2/R = I2R • Energy = Pt, where t is time • F = mA 050124

14. Conclusion • You have seen the basics of electricity and physics as used in renewable energy systems • This information provides you with a basic understanding of how electricity and physics principles support renewable energy systems 050124

15. References: Books • Brower, Michael. Cool Energy. Cambridge MA: The MIT Press, 1992. 0-262-02349-0, TJ807.9.U6B76, 333.79’4’0973. • Duffie, John and William A. Beckman. Solar Engineering of Thermal Processes. NY: John Wiley & Sons, Inc., 920 pp., 1991 • Gipe, Paul. Wind Energy for Home & Business. White River Junction, VT: Chelsea Green Pub. Co., 1993. 0-930031-64-4, TJ820.G57, 621.4’5 • Patel, Mukund R. Wind and Solar Power Systems. Boca Raton: CRC Press, 1999, 351 pp. ISBN 0-8493-1605-7, TK1541.P38 1999, 621.31’2136 • Sørensen, Bent. Renewable Energy, Second Edition. San Diego: Academic Press, 2000, 911 pp. ISBN 0-12-656152-4. 050124

16. References: Websites, etc. awea-windnet@yahoogroups.com. Wind Energy elist awea-wind-home@yahoogroups.com. Wind energy home powersite elist geothermal.marin.org/ on geothermal energy mailto:energyresources@egroups.com rredc.nrel.gov/wind/pubs/atlas/maps/chap2/2-01m.html PNNL wind energy map of CONUS windenergyexperimenter@yahoogroups.com. Elist for wind energy experimenters www.dieoff.org. Site devoted to the decline of energy and effects upon population www.ferc.gov/ Federal Energy Regulatory Commission www.hawaii.gov/dbedt/ert/otec_hi.html#anchor349152 on OTEC systems telosnet.com/wind/20th.html www.google.com/search?q=%22renewable+energy+course%22 solstice.crest.org/ dataweb.usbr.gov/html/powerplant_selection.html 050124

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