Transcript windmill-presentationx

Sasha Clark
Ilona Molotoka
Alexandria Butler
Shanel Crawford-Harris
Generator
Base Dowel
Rod
Windmill
 Our generator creates an electromotive force (emf)
which calculates the energy gained per unit of charge
in volts.
 The magnets inside the generator creates a magnetic
field.
 The fan spins our windmill, therefore rotating our
magnet to create an induced current which will
hopefully light our light bulb.
 The mechanical energy is converted to electrical
energy.
P=½APv^3
Velocity = 8 m/s
ρ is the density of air, which is 1 kg/m3.
Area of one blade:((length of one blade)^2)*π.
Length of one blade: 7.25 in = .184 m
Using that equation and our results, we get:
P=½ (kg/m^3)(.184m)^2(π)(8m/s)^3= 27.23 W
 That value is the ideal power from the air going into the generator in a perfect system, our
actual power is much lower, because energy is lost due to friction.
 The voltage and resistance of the generator: P=v^2/R
P=(.3)^2/45.7=.00196watts
 Efficiency = Power (Actual)/Power (input)=(.00196/27.23)*100=.007%
 The generator works through electromagnetic induction. By spinning the magnet, we
change magnetic field which induced a voltage in the coil.

Propellers did not work at a constant velocity.

Base rod broke.

Weak magnet.

Magnets bumping the inside of the box.
This project helped us:
 Understand and apply the concepts of electricity,
wind speed, and power.
 Use alternative resources to help build our project
successfully.
 Work together as a team towards a common goal.