Electrical Motor. A current through a wire in a magnetic field will have a force on it. The force is both perpendicular to the magnetic field and the current direction. Put a coil of wire on a shaft and it will rotate: You get a motor.
Motor Moving Illustration
Changing magnetic Field in a coil of wire produces a current. Faraday's law
A coil of wire turns in a magnetic field. This produces a continuously varying voltage which in turn produces an alternating current . This current can be changed into other forms of energy, like making toast
AC Generator Moving Illustration.
Transmission Lines
Cool Picture showing the strength of the electric field from transmission lines.
Transformers: Since V = R*I then Power = I*V = I(I*R) = I*I*R= I2R. The lower the resuistance the higher the current. But notice that power delivered is related to the current squared. Lower the current by 2, and you will loose less energy in the wires. An actual decrease of 4! Step Up and Step Down transformers. Increase Voltage so the current on the line is lower. Transformer Demo: Stepping up voltage with the coupling of a magnetic field.
Health Studies on Transmission Lines; Transmission lines havbe been controversial . Claims of increased lukemia and brain tumors. Other studies say it is not conclusive.
More Info about the Transmission Line photo
Switching High Voltage Lines can be tricky! Click on the picture to download the movie.
or go here for just the movie without the explanation.
Generating Electricity:
Make a large coil turning in a magnetic field, generate current, and we cook food, watch tv, turn on a light. The Basics on Generating Electricity. So all we need to do now is Turn The Crank.
Methods of Turning the crank. EWEB Resources and Types of Energy Sources
1.) Hydroelectric. Waterfalls and dams.
2.) Steam: Via Fossil Fuels : Burning a Fuel, making steam, shoot the steam at a turbine.
- Heat Engines
3.) Steam via Nuclear: Nuclear Fission Reaction results in some missing Mass. This mass is turned into heat. Heat is transferred to water which makes steam, shoot the steam at a turbine.
4.) Wind. 