An instrument, either physical or software-based, provides a means to determine the relationship between rotational force and the rate at which work is done. It uses known values, typically rotational speed and one of the two key parameters (torque or power), to compute the unknown value. For example, when inputting engine speed and measured rotational force, the device calculates the corresponding power output.
The assessment of rotational force and power is crucial in engineering design and analysis. The capacity to accurately determine these values contributes significantly to optimizing the performance and efficiency of mechanical systems, particularly in internal combustion engines, electric motors, and power transmission systems. Its historical relevance stems from the early days of engine development, where engineers sought to quantify the output of their designs, leading to standardized measurement techniques.