9. A great debate between two Italian scientists about the nature of current electricity Luigi Galvani 1737-1798 (Medical doctor) Alessandro Volta 1745 - 1827 (Physicist) vs
13. Simple machines are useful because they can make a physical job easier by changing the magnitude or the direction of the force exerted to do work. Why are they Useful?
14. Why is it that it's so easy to unscrew with a tool when you can't with your bare hands?
15. Coal is in short supply and nuclear energy is both expensive and potentially harmful to the environment. The solution could be in the use of renewable energy. Solar Energy
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19. Solar energy The Solar energy in use in a mobile home in Arizona. solar panels convert the solar energy into electrical energy. The use of solar cells are also supplemented by the use of wind turbines
More examples: The cause of stomach ulcer (Stress / Bacterium), Nature of light (Wave / Particle / Wave-particle duality), Earth and solar system (Geocentrism / Heliocentrism?)…….etc
Water piped through thin pipe gets heated and stored in insulated tank Photo cells turn solar energy into electrical not very efficient at the moment Furnace is an array of mirrors which concentrates suns rays to heat water into steam and turn turbine - possibly arranged as a tower full of turbines surrounded by greenhouse Demo solar cell lighting bulb/ whistle
Water rushes through to the Clutha River from Clyde Dam in Central Otago on the South Island of New Zealand. The largest hydroelectric dam in New Zealand is the Clyde Dam which was built along the Clutha River near the town of Clyde and generates a capacity of 400 megawatts. There are a million cubic meters of concrete in the dam with a further 200,000 in the powerhouse. The Clyde Dam stands at 100 meters in height, 70 meters wide at the base The Waikato River system is the most highly developed for electricity generation in New Zealand. It supplies eight hydro-electric stations and provides cooling water for two geothermal and one thermal station. The eleven stations on the Waikato produce 65% of the North Island's power generation and approximately 25% of New Zealand's hydro power. This is 15% of New Zealand's total power.
Write down what you see. Don’t tell the others. ---
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