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Materials
300 ft of 30 gauge copper wire
Brass Bar 6 rare earth
magnets fan blade Pin wheel Sheet of wood Paint
How Does It Work? Mechanical Aspects Propeller initiated by wind spins turning brass
shaft Magnets attached to the shaft are turned in
sequenceElectrical Aspects Magnets rotate perpendicular to copper wirecreating an electrical current Current flows from the wire to the flower attachment illuminating the lightbulb
Equations Used Theoretical
KE =
PTheoretical = KE/t Ptheoretical= 13.506 watts.
Actual P = IV P= (25)*(.6) = 15 watts
Efficiency [(Actual - Theoretical)/Theoretical] *
100
V = IR (Ohms Law)
A = Area L = Length p = Density of Air V = Voltage P = Power(watts) I = Current(Amps) v = wind velocity T = time R=Resistance
p=1.204kg/m3
A= * (.127m)2= .0314m2 =.05067m2
V=8.94 m/s
Issues
Original idea using gears did not work Additional amount of copper wire was needed Initial propeller used was not strong enough Coiling and mounting the copper wire Strength of magnets needed to be increased Maintaining alignment of the brass bar