C1: Energy Sources
All energy conversions undergo some form of quality degradation as some of the energy is dispersed as heat. The energy and materials in the original source change from a concentrated to dispersed form and the energy available to do useful work diminishes.
The videos below talk about useful energy source requirements and calculating efficiency.
efficiency of energy transfer = (useful output energy/total input energy) * 100. See the worked example on p. 655.
Energy density (ED) is a useful measure of the quality of a fuel that compares the energy released per unit volume:
energy density = energy released from fuel/volume of fuel consumed
Specific energy (SE) is the energy contained per unit mass of a fuel:
specific energy = energy released from fuel/mass of fuel consumed. See the worked example on p. 656.