pull-up resistor
A resistor that is connected between a signal and a positive voltage supply in a circuit to ensure that the signal is at a defined logic level.
Entries starting with P
582 entries.
pullability
The amount of change in frequency of a crystal oscillator in response to a change in load capacitance.
pulley-plough
A steam cable-drawn plowing system or type of horse-drawn grading plow utilizing rope-and-pulley mechanical advantage.
Pullman
nounRail equipment
A railroad passenger car; especially one of the luxurious ones named after the eponymous Pullman Palace Car Company.
pulpit
The railing at the bow of a boat, which sometimes extends past the deck; also called bow pulpit. The railing at the stern is sometimes called the stern pulpit or the pushpit.
pulsator
A jigging machine used in the South African diamond industry.
pulse
A brief increase in the strength of an electrical signal; an impulse.
pulse dialing
A system of telephone dialing in which each digit is transmitted as the equivalent number of pulses.
pulse repetition time
The elapsed time from the beginning of one pulse to the beginning of the next pulse.
pulverizer
A device for crushing clods of soil in a field.
pump escape
A fire engine equipped with a pump and a tall wheeled ladder.
pump valve
A mechanical device that controls the flow of fluids through a pump and its associated pipes.
pumping time
The amount of time a pump is in operation.
pumpkin
The housing for a differential, built into an axle of a vehicle; the housing and its contents.
punch
nounConstruction
An extension piece applied to the top of a pile; a dolly.
punchdown
A kind of electrical connection often used in telephony, having solid copper wires that are punched down into short open-ended slots which are a type of insulation-displacement connector. The slots contain blades which cut through the wire's insulation as it is punched down, and hold the wire in position while making electrical contact.
punt
A thin glass rod which is temporarily attached to a larger piece in order to better manipulate the larger piece.
pup
A new plant growing from a shoot that can be used for propagation.
purl
verbManufacturing
To use or create a purl stitch or stitches.
purple plague
The brittle, bright-purple intermetallic compound AuAl₂, formed when gold and aluminium are heated while in direct contact (for instance, if a gold wire is bonded to an aluminium contact pad and experiences heating due to electrical resistance).
purse-string
adjectiveManufacturing
Something that is formed, drawn, or closed in the manner of a traditional drawstring purse.
push notification
The delivery of information from a software application to a computing device without a specific request from the client.
push time
The time when a remote server sends an unsolicited update.
push-pull
adjectiveRail equipment
Operating with locomotives at both the head and rear of a train, or with a locomotive at one end and a driving position in the vehicle at the opposite end, so that the train can be driven from either end.
pushbar
A tubular or bar-shaped accessory mounted on the front bumper or chassis of a vehicle, especially trucks, SUVs, emergency service vehicles or locomotives, designed to push light loads (such as stalled vehicles) or guard against minor impacts without damaging the main bumper assembly.
pusher
An aircraft with the propeller behind the fuselage.
pushrod
A rigid reciprocating rod that, by its movement, transmits force to actuate a mechanism.
PUT
Initialism of programmable unijunction transistor.
put down
To set type in lowercase; to switch type from capital to lowercase letters.
put in
To call at (a place or port), especially as a deviation from an intended journey.
put to bed
To prepare (a newspaper) for printing.
put up
To set (matter) in capital letters; to switch text from lowercase to capital letters.
putter
One who pushes the small wagons in a coal mine, to transport the coal mined by the getter.
PVT
Initialism of pressure, volume, temperature.
PWA
Initialism of printed wire assembly.
PWB
printed wiring board - A circuit board blank created by etching away material thereby exposing non-conductive lands between conductive traces. What a printed circuit assembly is called before it is "stuffed" with components.
PWM
Initialism of pulsewidth modulation.
pycnometer
A vessel of precisely known volume used by weighing to determine the specific gravity or relative density of a liquid.
pylon
A tower-like structure, usually one of a series, used to support high-voltage electricity cables.
pyrogen
Any substance characterized by great flammability, typically used to coat electric matches.
pyrometamorphic
adjectiveMining and extraction
Rapidly changed by heat, such as a natural fire, or lava flow.
pâte de verre
A technique in which finely crushed glass, colorants, and binders are set in a mold and fired in a kiln.