Figure 5-38 is a graph for determining the size of a pond or lake required to store a given amount of energy. Notice the large values. We sometimes hear of the idea that a few 55-gallon drums up in the attic ought to hold enough water to keep the lights burning all night, while the water trickles out of the drums turning a water turbine along its path. Unfortunately, this would not produce much power. For example, if you substitute a 1956

'Energy density is a measure of the amount of energy (kWh) per pound of battery. Since cost of items relates to weight of materials in them, higher energy density tends to enhance lower energy cost.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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