Resources that you cannot sometimes predict the amount of energy they can produce are
coal
wood
wind turbines
Explanation:
These energy sources listed depends on internal and external conditions to produce an exact amount of energy and if any of its composition is altered you cant predict exactly what amount of energy they can produce
Example 1: coal depends on the type and carbon content of the coal used to predict/determine the amount of energy it can be produced when burnt. therefore coals of same quantity/size might not produce same amount of energy
2: wood depends on the carbon content and also the type and weight of the wood been burnt for energy therefore energy produced by same quantity of wood of different carbon content might not be the same
3: wind turbines produce different energy depending on how windy and wet the day might be therefore its energy production is unpredictable because it depends on different weather conditions
Coal is a nonrenewable resource. It can be used for the generation of electricity as the burning of the coal as fuel liberates immense heat energy depending upon the carbon content of the coal. The amount of energy liberated by the coal depends upon the type of coal used hence, the energy yield can remain unpredictable. Wood is the source of biomass energy. It can be burned upon to obtain heat energy. The energy produce depends upon the carbon content and weight of the wooden logs used.
The energy harnessed by a wind turbine is also unpredictable because in a hot humid day and a wet rainy day wind energy cannot be captured.
