Energy Efficiency
#Draft Start by defining Power Density and Energy Density. Energy = VIt = Vq Describe Energy as the area of a rectangle with sides Voltage and Capacity or Charge (q=It) Contained. If this is the energy contained per unit mass of a material, this is it's Energy Density. Now, if we consider the energy utilized per unit time, that is Power Density. From this, you can know that for a given fuel, if its Power Density is Higher, its duration is lower. Now, this is the energy conversion for chemical batteries. We also often see the Power Density of Gasoline and other fuels mentioned, which unsurprisingly have the same units. In case of Gasoline and Wood, we take the Energy Density as the Heat of Combustion per unit mass. But Combustion is yet another chemical reaction, a redox reaction. Except that in this case, we utilize the heat instead of the flow of electrons. What are the other sources of energy? Another one would be the energy from motion (Wind, Water), Geothermal (Heat), Solar (Li