Our Christmahanakwanzika Windmill Presentation

Sasha ClarkIlona MolotokaAlexandria ButlerShanel Crawford-

Harris

Team Members

Device Design

Generator

Base Dowel Rod

Windmill

How it works?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.

Calculations…P=½APv^3Velocity = 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.

The Building Process

Construction issues Propellers did not work at a constant

velocity.

Base rod broke.

Weak magnet.

Magnets bumping the inside of the box.

ConclusionThis 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.