1. Section 14.3

2. I. Electromagnetic Induction
Faraday’s Law- An electric current can be produced in a circuit by a changing magnetic field
When the loop moves in or out of the magnetic field a current is induced in the wire
When the wire in a circuit moves perpendicular to a magnetic field the wire is maximized (parallel –no current)

3. 2 Generators convert mechanical energy to electrical energy
Generator- device that uses electromagnetic induction to convert mechanical to electrical energy

4. Electricity is produced in a generating plant
Electricity is produced in a generating plant. The simplest type of generator has two main components: a rotating magnet called the “rotor” which turns inside stationary coils of copper wire called the “stator.” When the rotor rotates through the magnetic field, it generates a flow of current through the copper coils of the stator. Generating plants must use some form of energy or fuel to turn the rotor

5. Alternating current
Generator that changes direction at regular intervals
Currents in the outlets in your home are AC

6. 3. Large power plants use generators to convert mechanical energy to electrical

7. 4. Dams are built to harness the kinetic energy of falling water

8. 5. Coal power plants use heat from burning coal
Coal-fired power plants currently provide more than 50 percent of the U.S. electricity

9. II. Transformers
A device that can change one alternating current voltage to different current voltage
Primary and secondary circuits in a transformer each turn one time, then voltage across each is about equal

11. 1. Step – down transformer
Transformers like this one are used to reduce the voltage across power lines are safer to use