question of the day question: what do you think is meant by “alternative energy?” answer:...
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Question of the DayQuestion of the DayQuestion of the DayQuestion of the Day
Question: What do you think is meant by “Alternative Energy?”
Answer: … … …
Turn In:19.2 Worksheet (1/2 Page)
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
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?
Is there a better way?
• Burn something• Heat water• Turn a turbine• Generator generates electricity
which can be sent to homes and businesses
Geothermal
How deep are geothermal wells?What do they use the steam for?Why is geothermal considered a sustainable energy source?
Is there an even better way?
• Burn something• Heat water• Turn a turbine• Take in solar energy and convert it
to electrical energy