1. LINDSAY BRENNAN KRISTINA TRASE
ELECTRICITY
LINDSAY BRENNAN
KRISTINA TRASE

2. How is Electricity Generated?
When a magnetic field is in motion relative to a copper wire, it triggers the flow of electrons in the wire, creating electricity.

3. Electricity Timeline
1752
Benjamin Franklin invented the lightening rod - he demonstrated lightning was electricity.
1786
Italian physician, Luigi Galvani demonstrated what we now understand to be the electrical basis of nerve impulses when he made frog muscles twitch by jolting them with a spark from an electrostatic machine.
1800
First electric battery invented by Alessandro Volta. Volta proved that electricity could travel over wires.
1820
Relationship of electricity and magnetism confirmed by Hans Christian Oersted who observed that electrical currents effected the needle on a compass and Marie Ampere, who discovered that a coil of wires acted like a magnet when a current is passed thorough it.

4. 1821
First electric motor invented by Michael Faraday.
1826
Ohms Law written by Georg Simon Ohm states that "conduction law that relates potential, current, and circuit resistance"
1831
Principles of electromagnetism induction, generation and transmission discovered by Michael Faraday.
1879
Edison demonstrates his incandescent lamp, Menlo Park, New Jersey.
1886
The Westinghouse Electric Company is organized. 40 to 50 water powered electric plants reported on line or under construction in the U.S. and Canada.

5. Ac/dc current DC CURRENT AC CURRENT
Direct current electricity flows in one direction all the time. Electricity using batteries is DC electricity. The poles of a battery always stay the same.
AC electricity is also known as alternating current. The electrical source switches (alternates) polarity many times a second. AC electricity is what comes out of your outlets at home.
AC CURRENT
NEVER PLAY WITH POWER OUTLETS!!

6. Circuits
The steady flow of electricity is called an electric current. A current will move along a wire or a path called a circuit. Amps are used to measure how much electric current is moving through a wire.
Circuit means to “go around.”

7. Series Parallel Lights in our homes are wired in parallel circuits.
Has a single loop for electrons to travel round
Components are connected one after another
Current is the same at all points
Voltage is shared between components
Series
Has two or more paths for electrons to flow down
Current is shared between the branches
Sum of the current in each branch = total current
Voltage loss is the same across components
Parallel
Lights in our homes are wired in parallel circuits.

8. Symbols Current measured in amps (A)
Voltage (V) – Increase or decrease in the amount of electrical energy carried by the current.
Parallel Circuit
Wire
Cell/Battery
Light
On/off switch
Resistor
Voltmeter
Ohmmeter
Symbols
Series Circuit

9. Equations
KEY:
P= Power
E= Voltage
I= Current
R= Resistance

10. Alternative Energy Wind Power Hydropower Geothermal Power Solar Power
Biomass Energy
Wind power, hydropower, and geothermal energy work basically the same way. A movement in the environment causes a turbine to spin which spins a generator. The generator converts the mechanical energy to electrical energy.

11. Wind Power
Wind turbines can be found all over the US but the most productive states are Texas, Iowa, California, and Washington.

12. Hydropower Moving water turns a turbine.
Hydropower plants are found in places with dams or waterfalls.
It accounted for 6% of total U.S. electricity generation and 67% of generation from renewables in 2008.

13. geoThermal
Geothermal energy can be found where hot spots are located in the earth.
Geothermal energy is heat from
within the Earth. We can recover
this heat as steam or hot water
and use it to heat buildings or
generate electricity.
Geothermal energy is a renewable energy source because the heat is continuously produced inside the Earth.

14. SoLar Power
Solar energy can be converted to electricity in two ways: Photovoltaic cells (or solar cells) and Concentrating Solar Power Plants
Photovoltaic cells change sunlight directly into electricity while concentrating cells generate electricity by using the heat from solar thermal collectors to heat a fluid which produces steam that is used to power the generator.

15. Biomass Energy
When woods, crops, manure, and some garbage are burned, the chemical energy in biomass is released as heat. These things can be burned to also produce steam which can generate electricity.

16. How the U.S. Generates Electricity

17. Comparison of Energy Consumption
Country
Average KWH
United States
3,920,613,000,000
China
2,054,568,000,000
Japan
1,031,262,000,000
Canada
548,794,000,000
Mexico
187,617,000,000
Haiti
256,000,000
5% (USA population) of the world’s population consumes 23% of its energy!

18. What is Energy Star?
ENERGY STAR is a joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy helping us all save money and protect the environment through energy efficient products and practices.

19. and watch us generate electricity
The End
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