Question

when energy is put into a system, some of that energy is lost as what? energy is never lost heat, sound, and light

Explanation:

According to the law of conservation of energy, energy is never lost. It just changes forms. When energy is put into a system, some of it is lost as heat, sound, and light due to inefficiencies in the system. For example, when a machine operates, it produces heat (from friction), sound (from moving parts), and sometimes light (if there are electrical sparks or other phenomena).

Answer:

When energy is put into a system, some of that energy is lost as heat, sound, and light.