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Energy Transformations
Energy Transformations
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Chemical → Thermal (e.g., combustion)
Electrical → Mechanical (e.g., electric motor)
Nuclear → Electrical (e.g., nuclear power plant)
Solar → Electrical (e.g., solar panels)
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Useful energy: the desired output (e.g., light in a bulb)
Wasted energy: often heat, sound, vibration, etc.
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Impacts on Society
positive
Improves quality of life (heating, transportation, electricity)
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negative
Overuse of non-renewable resources (oil, coal, gas)
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environmental impacts
negative
Air and water pollution (e.g., emissions from power plants)
Habitat destruction (e.g., hydroelectric dams)
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positive
Development of cleaner energy (e.g., solar, wind, hydro)
Technologies for reducing emissions (e.g., electric vehicles)
Energy conservation strategies (e.g., insulation, smart grids)
key energy formulas
kinetic energy
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m = mass (kg), v = velocity (m/s)
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electrical energy (E)
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P = power (w), I = current (A), V = voltage (V), t = time (s)
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