Does cellular respiration result in a net input of energy or a net output of energy?

Cellular respiration results in net output of energy.

Explanation:

Cellular respiration can be described as a process in which cells convert glucose and oxygen into carbon dioxide and water. Energy is released in the form of ATP in the process hence, it gives a net output of energy.

As a result of cellular respiration, two molecules of energy (ATP) are produced in glycolysis, Kreb's cycle also produces 2 molecules of ATP, 34 molecules of energy (ATP) are produced by the electron transport chain