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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Glossary of mechanical engineering | 9/12 | https://en.wikipedia.org/wiki/Glossary_of_mechanical_engineering | reference | science, encyclopedia | 2026-05-05T07:51:05.490215+00:00 | kb-cron |
== E == Elasticity – In physics, elasticity is the ability of a body to resist a distorting influence and to return to its original size and shape when that influence or force is removed. Solid objects will deform when adequate forces are applied to them. If the material is elastic, the object will return to its initial shape and size when these forces are removed. Hooke's law states that the force should be proportional to the extension. The physical reasons for elastic behavior can be quite different for different materials. In metals, the atomic lattice changes size and shape when forces are applied (energy is added to the system). When forces are removed, the lattice goes back to the original lower energy state. For rubbers and other polymers, elasticity is caused by the stretching of polymer chains when forces are applied. Electric current – a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume. Electric motor – an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of rotation of a shaft. Electric motors can be powered by direct current (DC) sources, such as from batteries, motor vehicles or rectifiers, or by alternating current (AC) sources, such as a power grid, inverters or electrical generators. An electric generator is mechanically identical to an electric motor, but operates in the reverse direction, converting mechanical energy into electrical energy. Electrical engineering – Electrical engineering is an engineering discipline concerned with the study, design and application of equipment, devices and systems which use electricity, electronics, and electromagnetism. Electrical circuit – an electrical network consisting of a closed loop, giving a return path for the current. Electrical network – an interconnection of electrical components (e.g., batteries, resistors, inductors, capacitors, switches, transistors) or a model of such an interconnection, consisting of electrical elements (e.g., voltage sources, current sources, resistances, inductances, capacitances). Electromagnetism – Electronic circuit – a type of electrical circuit which is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow. Electronics – Energy – Engine – Engineering – the use of scientific principles to design and build machines, structures, and other items. Engineering cybernetics – Engineering drawing – a type of technical drawing that is used to convey information about an object. Detail drawings commonly specify the dimensions and tolerances for the construction of a single component, while a master drawing or assembly drawing links the detail drawings for each component in a system. Only required information is typically specified, usually only in one place to avoid inconsistency. Engineering economics – a subset of economics that studies the behavior of individuals and firms in making engineering decisions regarding the allocation of limited resources. It is a simplified application of microeconomics in that it assumes elements such as price determination, competition and demand/supply to be fixed inputs. Engineering ethics – a field that examines and sets the obligations by engineers to society, to their clients, and to the profession. Many engineering professional societies have prepared codes of ethics which are largely similar to each other. Engineering management – the combination of technological problem-solving and the organizational, administrative, legal and planning abilities of management in order to oversee the operational performance of complex engineering driven enterprises. Engineering society – a professional organization for engineers of various disciplines. Some are umbrella type organizations which accept many different disciplines, while others are discipline-specific. There are also many student-run engineering societies, commonly at universities or technical colleges. Exploratory engineering – the process of designing and analyzing detailed hypothetical models of systems that are not feasible with current technologies or methods, but do seem to be clearly within the bounds of what science considers to be possible. It usually results in prototypes or computer simulations that are as convincing as possible to those that know the relevant science, given the lack of experimental confirmation.
== F == Fits and tolerances - Factor of safety – False precision – Fast fracture – Fatigue – Fillet – First law of thermodynamics – states that energy can neither be created nor destroyed; it can change only from one form to another. Finite element analysis – Flange - Fluid mechanics – Flywheel – Force – an influence that can push or pull an object to change its motion. A force can cause an object with mass to change its velocity (e.g. moving from a state of rest), i.e., to accelerate. A force has both magnitude and direction, making it a vector quantity. Force density – Forging – Four-bar linkage – Four-stroke cycle – Four wheel drive – Friction – the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction including static friction between non-moving surfaces and kinetic friction between moving surfaces; for two given solid surfaces, static friction is greater than kinetic friction. Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other. Front wheel drive – Fundamentals of Engineering exam – Fusible plug – Fusion deposition modelling –