# Principles of Engineering Final

## 41 terms

### engineer

a person trained and skilled in the design, construction, and use of engines or machines, or in any of various branches of engineering

### engineering

the art or science of making practical application of the knowledge of pure sciences, as physics or chemistry, as in the construction of engines, bridges, buildings, mines, ships, and chemical plants

### hydraulics

the science that deals with the laws governing water or other liquids in motion and their applications in engineering; practical or applied hydrodynamics

P=F/A

V1 / T1= V2 / T2

### Boyle's Law

P1 x V1 = P2 x V2

...

### Circuit

a circular journey or one beginning and ending at the same place; a round

### parallel circuit

a closed electrical circuit in which the current is divided into two or more paths and then returns via a common path to complete the circuit

### series circuit

a circuit having its parts connected serially

### voltage

electromotive force or potential difference expressed in volts

### current

A flow of positive electric charge. The strength of current flow in any medium is related to voltage differences in that medium, as well as the electrical properties of the medium, and is measured in amperes. Since electrons are stipulated to have a negative charge, current in an electrical circuit actually flows in the opposite direction of the movement of electrons

### resistance

the opposition to a flow of electric current through a circuit component, medium, or substance. It is the magnitude of the real part of the impedance and is measured in ohms

### feedback

the process of returning part of the output of a circuit, system, or device to the input, either to oppose the input (negative feedback) or to aid the input (positive feedback)

### torque

something that produces or tends to produce torsion or rotation; the moment of a force or system of forces tending to cause rotation

### moment

moment = force x distance

### compression

to press together; force into less space.

### tension

the act of stretching or straining

### static equilibrium

when effort and resistance is equal

### centroid

the point that may be considered as the center of a one- or two-dimensional figure, the sum of the displacements of all points in the figure from such a point being zero

### magnetism

the properties of attraction possessed by magnets

### ferrous

of or containing iron in the divalent state; designating an iron (II) compound

### brittle

having hardness and rigidity but little tensile strength; breaking readily with a comparatively smooth fracture, as glass

### ductile

capable of being hammered out thin, as certain metals; malleable

### polymer

a compound of high molecular weight derived either by the addition of many smaller molecules, as polyethylene, or by the condensation of many smaller molecules with the elimination of water, alcohol, or the like, as nylon

### compound

composed of two or more parts, elements, or ingredients

### composite

made up of disparate or separate parts or elements; compound

### malleable

capable of being extended or shaped by hammering or by pressure from rollers

### metal

any of various opaque, fusible, ductile, and typically lustrous substances that are good conductors of electricity and heat, form cations by loss of electrons, and yield basic oxides and hydroxides

### constraint

limitation or restriction

### innovation

something new or different introduced

### design

to prepare the preliminary sketch or the plans for (a work to be executed), especially to plan the form and structure of

### photo-transistor

a transistor that amplifies current induced by photoconductivity

### photo-resistor

A resistor whose resistance varies as a function of the intensity of light it is exposed to

### efficiency

the ratio of the work done or energy developed by a machine, engine, etc., to the energy supplied to it, usually expressed as a percentage

### microprocessor

an integrated computer circuit that performs all the functions of a CPU

### pneumatics

the branch of physics that deals with the mechanical properties of air and other gases

### reliability

An attribute of any system that consistently produces the same results, preferably meeting or exceeding its specifications. The term may be qualified

### work

the force applied on an object times the distance traveled by an object

work = Force x Distance

### gear train

a set of automobile gears that transmit power

### vector

a quantity possessing both magnitude and direction, represented by an arrow the direction of which indicates the direction of the quantity and the length of which is proportional to the magnitude