Engine (such as pneumatic motors), springs (clockwork motors) and elastic bands. Historic military siege engines included large catapults, trebuchets, and (to some extent) battering rams were powered by potential energy. A pneumatic motor is a machine that converts potential energy in the form of compressed air into mechanical work. Pneumatic motors generally convert the compressed air to mechanical work though either linear or rotary motion. Linear motion can come from either a diaphragm or piston actuator, while rotary motion is supplied by either a vane type air motor or piston air motor. Pneumatic motors have found widespread success in the hand-held
Potential energy another electrically charged object nearby. The work "W" required to move "q" from "A" to any point "B" in the electrostatic force field is given by typically given in "J" for Joules. A related quantity called "electric potential" (commonly denoted with a "V" for voltage) is equal to the electric potential energy per unit charge. The energy of a magnetic moment formula_44 in an externally produced magnetic B-field has potential energy The magnetization in a field is where the integral can be over all space or, equivalently, where is nonzero. Magnetic potential energy is the form of energy related not