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Question of the Day Question: What do you think is meant by “Alternative Energy?” Answer: … … … Turn In: 19.2 Worksheet (1/2 Page) 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 kiteflying 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 water 3. 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 Fuels: Coal, Oil, Natural gas Fire 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 Panels Solar panels convert photons to electricity Solar Power Why is solar power important for the Brazilian village? What could solar powered airplanes replace?
