Ohm’s Law:Airway resistance is used in respiratory physiology to describe mechanical factors which limit the access of inspired air to the pulmonary alveoli, and thus determine airflow. It is determined by the diameter of the airways and by the density of the inspired gas and can be calculated using Ohm's law.
Ohm's`Law, a fundamental law of physics, states that:-current (I) equals the voltage difference (DV) divided by resistance (R).
V = I/R.
In relating Ohm's Law to air flow, the voltage difference is the pressure gradient between mouth and alveolus, the resistance is the resistance to flow (R) offered by the airways and their interactions with the flowing air, and the current is the air flow (F).
Delta P R = resistance
R = ------- Delta P = change in pressure
F F = flow