Power2011_Pres - Portable Power Generation Maggie Modica...

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Portable Power Generation Maggie Modica, Jason Clark
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Portable Power Agenda Hand Crank Power Generation Faraday’s Law EMF Lorentz Force Handheld Power Generation No Crank Issues & Takeaways
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Hand Crank Generators
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Hand Cranks Used by military in WWII to power field communication devices More popular today in household items Radios, flashlights, small electric fans Can be made to provide power to cell phones and music players
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Hand Cranks GN-58 hand-crank generator used by military to power RS-1 radio http://www.militaryradio.com/spyradio/rs1.html
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Faraday’s Law emf = (-d/dt) * Ψ = voltage Ψ = (B) (A) = magnetic flux A = area of loop B = magnetic field (-d/dt) = time derivative of the flux Magnetic flux = magnetic field lines over unit area Change of magnetic field in time Voltage is generated from a change in magnetic flux
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Electromotive Force (EMF) When a voltage is generated by a battery (or magnetic force) emf = voltage
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Lorentz Force F charged particle = q [ E + (VxB) ]
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