Part A: Introduction (02:24)
Heat energy is usually a byproduct of energy transformation. Efficiency measures how much useful energy you get out of something. Incandescent light bulbs only transform 2% of energy into light; LED transform 20%.
Part B: Power (in Watts) (05:21)
Watts (w) express power, the amount of energy transformed per second, and are equivalent to joules/second. Carbohydrates burn faster than fat in humans. Learn about inefficient incandescent light bulbs.
Part C: Improving Efficiency (06:15)
Learn about incandescent and LED bulb history. Compare efficiency, power and light output in incandescent, fluorescent and LED bulbs. Sankey diagrams show energy input and output in devices; companies are trying to improve solar panel efficiency.
Part D: Heat Wastage and Energy "Loss" (09:09)
Plants convert light energy to chemical energy with 1-2% efficiency. Car engines are about 25% efficient; excess kinetic energy transforms to heat energy while braking. Humans are also 25% efficient. Learn about energy "loss" through bouncing ball and trampoline examples.
Part E: Efficiency in Nature and Industry (06:34)
Learn about the role of ligaments, calf muscles, and Achilles tendons in producing spring and contributing to human long distance running capacity. View efficiency in different species and in airplane design. Hear how to improve heat transfer efficiency in water.
Credits: Shedding Light on Energy: Episode 3—Energy Efficiency (00:37)
Credits: Shedding Light on Energy: Episode 3—Energy Efficiency
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