Answer:
Some forms of energy are more useful than others. Using energy always makes it less useful, even though no energy is actually destroyed.
Kinetic energy and electricity are the most useful forms. These are "high-quality" because they can be transformed almost completely into any other type of energy. Electricity, for example, can be easily used to generate heat (thermal energy) or light (radiant energy), break chemical bonds (chemical energy), move objects (kinetic energy), or lift objects (gravitational potential energy).
The least useful form of energy is low-temperature thermal energy. It can still be converted back to a higher-quality form, but useful energy is always lost in this process. Converting energy to a less-useful form and then trying to work backwards never gets 100% of the useful energy back.
Explanation:
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