Question

_________ expresses the relationship between a driving gear and a driven gear in a system. gear train driven gear gear ratio idler gears driving gear

Explanation:

Gear ratio is a fundamental concept in gear systems. It is calculated as the ratio of the number of teeth on the driven gear to the number of teeth on the driving gear (or the inverse ratio of their rotational speeds). This ratio precisely defines how the driving gear and driven gear interact in terms of speed and torque transmission within a gear - based mechanical system.

Answer:

Gear Ratio