For rocket engines, the effectiveness is determined by specific fuel consumption with regard to the generated thrust, TSFC [kg/Ns] (Thrust Specific Fuel Consumption). Effectiveness is thus determined regardless of the work done. In everyday energy conversion systems, such as coil and heater, effectiveness is determined by efficiency, which represents the ratio of the work done to the energy input of a system. A coil that generates force and does not perform work has the same efficiency as a non-generating heater. We introduced a new parameter FSPC [J/Ns] (Force Specific Power Consumption) to evaluate the system's performance according to the generated force, which makes it possible to distinguish between the system able to perform work and the system unable to perform work. The introduced FSPC parameter is not directly related to the work, so it is also useful for systems with zero efficiency. For example, FSPC allows distinguishing two systems with zero efficiency, one that is capable to perform work, from another that is not. In the case of a coil with zero efficiency, we found that the effectiveness of the coil increases with increasing force, generated by the coil. In applications where a system maintains a force at zero efficiency, it would be important to know the performance of each system in terms of power consumption, depending on the magnitude of generated force. Such systems could be, in the future, evaluated, compared, and the most effective could be selected for specific applications, by using the introduced FSPC parameter.
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