Overhead electrical fixture which is operated by use of a "cord", which hangs down and is used where having to run the wire through a wall is difficult.
Pull-out spray
Single-control kitchen faucet which offers a retractable hose and sprayhead to be used for food preparation and cleaning.
Pulley
Rotating wheel, which lifts heavy loads or aid in transmitting power, by use of the belt or cable hat fits into the rim around the wheel.
Pulse-width-modulated (pwm) wave inverter
A type of power inverter that produce a high quality (nearly sinusoidal) voltage, at minimum current harmonics.
Pulsed power welding
Electric arc process of welding using computer controlled welding machine, which emits programmed short pulses of electric power.
Pultrusion
The shaping of an object, such as those made of fiberglass, by pulling it through a die.
Pulverize
(1) To crush or grind into a powder or dust. (2) To break down completely.
Pumice
A spongy, light, porous volcanic rock used in solid or powdered form for smoothing, scouring, and polishing.
Pump
Any of the various machines that force a liquid or gas into or through, or draw it out of something, by pressure or suction.
Pumped storage facility
A type of power generating facility that pumps water to a storage reservoir during off-peak periods, and uses the stored water (by allowing it to fall through a hydro turbine) to generate power during peak periods. The pumping energy is typically supplied by lower cost base power capacity, and the peaking power capacity is of greater value, even though there is a net loss of power in the process.
