The amount of usable energy that is available for doing work in a system is

The amount of usable energy which is available for doing work when the temperature and pressure are uniform throughout the system is called

Usable energy available from respiration is

If the amount of heat given to a system is 50 J and work done on the system is 15 J, then change in internal energy of the system will be

Calculate the amount of energy available to lion in the following food chain if plants have 20000 J of energy available from the sun: Plants to Deer to Lion

Approximately what amount of energy is available to one trophic level from one level lower to it?