The basal rate of consumption of O₂ by a 70-kg human is about 16 mol of O₂ per day. This O₂ oxidizes food and is reduced to H₂O, providing energy for the organism:

(a) To what current (in amperes = C/s) does this respiration rate correspond? (Current is defined by the flow of electrons from food to O₂.)

(b) Compare your answer in part (a) with the current drawn by a refrigerator using 5.00 × 10² W at 115 V. Remember that power (in watts) = work/s E ∙ I.

(c) If the electrons flow from nicotinamide adenine dinucleotide (NADH) to O₂, they experience a potential drop of 1.1 V. What is the power output (in watts) of our human friend?

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O2 + 4H* + 4e = 2H20