Intro to Millwright 2025 – 400 Free Practice Questions to Pass the Exam

Stored energy is the correct answer because it refers to energy that is kept in a system in a form that can be utilized later, even after the primary energy source has been turned off or disconnected. This is often seen in systems that use energy storage mechanisms such as springs, batteries, or capacitors. For instance, a machine might still have potential energy in a compressed spring or residual energy in a hydraulic system.

Active energy, on the other hand, typically refers to energy being actively utilized in a process, such as operating machinery. Once the primary energy is cut off, active energy would diminish, making it less relevant in this context. Fluid energy relates to the energy possessed by fluids due to their movement or pressure and might dissipate as fluid flows out or settles, rather than remaining in the system after disconnection. Kinetic energy is the energy of motion, and if a machine has stopped moving due to the disconnection, the kinetic energy would be minimal or non-existent at that point, rather than remaining as energy within the system. Therefore, stored energy is the most accurate term for energy that persists in a machine even after disconnection from its primary energy source.