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Question: What do you think is meant by “Alternative Energy?”

Answer: … … …

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Electricity

What is electricity?

• Electricity is the flow of electrons from negative to positive

How did we discover electricity? • Many people think

Benjamin Franklin discovered electricity with his famous kite-flying experiments in 1752, but electricity was not discovered all at once.

Discovery of Electricity

• In 1800, Alessandro Volta, an Italian scientist, created the first battery

• What is a battery?• Device that can convert

stored chemical energy into electricity

The First Electric Generator

• 1821: Michael Faraday was the first one to realize that an electric current could be produced by passing a magnet through a copper wire• this was the first generator

Electricity for Everyone

• 1879: Thomas Edison invents the light bulb

• 1882: He designs and builds the first electric power plant • How we get our electricity

today

How much would that cost?

• If they used 200 kWhr in 1/7 sec• At a cost of .1 $/kWhr for 12 hours

$ = 200 kWhr x 12hrs x 3600s x $ .1 1.7 s hr kWhr

= $508,235/ night

How do we generate electricity?

1. Burn something: coal, natural gas, oil, “Nuclear Fuel”

2. Heat water3. Steam turns a turbine (fan)4. Turbine spins an electric

generator

Generating Electricity

Why does he wear a metal suit? What are the 3 things he is afraid of?

Electric Generator Function

• In a power plant the spinning of magnet relative to a coil of copper wire generates electricity

Electrical Generation

Which spins in a hydroelectric power plant generator, the magnet or the coil of wire? What do they do to the voltage before they deliver electricity to the home?

Electricity Generation

CO2 & others

Fire

Fuels: Coal,Oil,Natural gas

Nuclear

Is there a better way?

• Burn something• Heat water• Turn a turbine• Generator generates electricity

which can be sent to homes and businesses

Hydropower

Geothermal

Geothermal

How deep are geothermal wells?What do they use the steam for?Why is geothermal considered a sustainable energy source?

Wind Power

Is there an even better way?

• Burn something• Heat water• Turn a turbine• Take in solar energy and convert it

to electrical energy

Solar PanelsSolar panels convert photons to electricity

Solar Power

Why is solar power important for the Brazilian village? What could solar powered airplanes replace?