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| P
Type |
positive type
semiconductor (too few electrons) |
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| Packaging |
the
wrapping around products that is used to protect the product from damage,
to keep the product clean, to extend shelf life, to promote the product
and to provide information about the product |
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| Parallel
(1) |
An arrangement
of terminals where poles of like polarity are connected together |
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| PCB |
printed circuit
board |
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| Permanent
Joint |
a
joining process in which the joining is permanent and not easily reversed
e.g. glueing or welding |
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| Perspective
Drawing |
a
method of two dimensional drawing that gives the illusion of depth |
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| PIC |
peripheral
interface controller: a programmable computer on a single chip, a type of microcontroller |
 |
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| Pictograms |
simplified
drawings of activities such as swimming etc |
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| Pictorial
Drawing |
a realistic rendered
drawing of an object |
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| Piezoelectric
Crystal |
a material that
can change shape when a voltage is applied and can produce a voltage if
its shape is changed |
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| Pilot
Hole |
a small hole
used to guide a larger drill to the correct position |
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| Plane |
a
device used to reduce the thickness of wood |
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| Planishing |
hammering the
surface of sheet metal to smooth and work harden it |
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| Plastic
Memory |
the way thermoplastics
try to return to their original shape when re-heated |
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| Plywood |
a
strong manufactured board made from thin layers of wood running at 900 |
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| Pneumatics |
a system of valves
and cylinders driven
by compressed air |
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| Polymer |
a molecule
formed when monomers are joined together |
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| Polystyrene
Foam |
a thermoplastic
material used for modelling and packaging |
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| Port |
where air enters
and leaves a pneumatic component |
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| Positive
electrode |
the conductor
connected to the more positive voltage
in a circuit. |
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| Potentiometer |
a variable
resistor |
 |
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| Precious
metal |
rare metals such
as gold, silver and platinum |
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| Presentation
Drawing |
coloured,
rendered drawings showing a product as realistically as possible |
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| Preserve |
to keep fruit
and vegetables from spoiling |
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| Preset |
a small variable
resistor usually mounted on a PCB and adjusted by a
screwdriver |
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| Primary
research |
research which you collect |
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| Prioritize |
put things in
order of importance |
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| Product |
a manufactured
item usually bought by a consumer |
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| Product
Evaluation |
-
Looking at existing products to see how they are made. What materials have
been used etc. |
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| Product
Image |
the
characteristics of a product as perceived by the consumer e.g. hi tech,
low tech, eco friendly, traditional, modern, value for money etc |
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| Properties |
the
characteristics of a material or ingredient |
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| Proposals |
the things you
intend to do |
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| Protein |
ingredient in
certain foods which builds muscle |
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| Prototype |
a
one-off representation of a design that shows how it works, what it looks
like and how it is used so that it can be fully evaluated. |
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| PTC |
positive
temperature coefficient |
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| Pulley |
a
circular disc or wheel used with a belt
that grips onto it. There is usually a V-shaped groove cut into the circumference
of the pulley to help the belt grip. |
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| Pulse
width |
the length of
time a signal is on or off |
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| Pulses |
generic term for
beans, peas and lentils |
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| Push
fit |
a
tight fit that holds two parts together. You can use a push fit to join a wheel
to an axle so that as the wheel turns the axle turns too. |
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PVA |
poly
vinyl acetate |
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| PVC |
Poly vinyl
chloride |
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