The terms "energy balance" and "energy payback ratio", or "energy ratio", are used to describe system energy output related to system energy input.
The energy balance can be expressed as
Eo = dE + Ei (1)
dE = Eo - Ei (1b)
dE = energy balance
Eo = energy output
Ei = energy input
The energy ratio - system energy output to system energy input - can be expressed as
ER = Eo / Ei (2)
ER = energy ratio
Climate, meteorology, sun, wind and environmental related engineering resources.
The First Law of Thermodynamics simply states that energy can be neither created nor destroyed (conservation of energy). Thus power generation processes and energy sources actually involve conversion of energy from one form to another, rather than creation of energy from nothing.
The relative values between quantities - ratios and proportions.