Page 169 - Knowledge Organiser Yr8 24-25

Knowledge Base: Design & Technology Electrical & Electronic systems – Year 8 | Autumn STEM Challenge Structures Catapult
4. Electronics Fabrication
4.1
printed circuit board (PCB)
A ceramic board used to connect electrical components together.
1. Polymers
1.1 polymer
1.2 thermoplastic
1.3 thermoset
The D&T terminology for all plastics.
Polymers that can be recycled by reheating and reforming. Designed to withstand high temperatures but cannot be recycled.
4.2 resistor
4.4 capacitor
4.5 integrated circuit
Reduces electrical current flow.
Stores electrical energy.
4.3
light emitting diode (L.E.D)
A semiconductor diode which glows when a voltage is applied.
1.4
vacuum forming
A deforming process, whereby a sheet of HIPS is heated and then pulled around a single mould using suction.
1.5
(HIPS) High Impact Polystyrene Sheet
A thermoplastic that is flexible and resistant. It can be food safe and is used for vacuum forming.
1.6
polypropylene
A thermoplastic that is flexible, tough and light weight. It is used in many kitchen, medical and stationery products.
1.7
epoxy resin (ER) araldite
A thermoset plastic supplied as two liquids; a resin and a hardener. It is used as glue to bond different materials together.
1.8
urea formaldehyde (UF)
A thermoset plastic that is heat resistant and commonly used in electrical fittings.
Processes information.
4.6
digital signal
A Digital Signal that is either on or off (one or naught) e.g. a switch.
4.7
analogue signal
A continuous signal with an infinite range of values between minimum and maximum points.
solder wire
soldering iron
LED printed circuit board
2. CAD CAM- Editing and Contouring a Bitmap image
2.1
contour tool
Use this command to draw a contour (i.e. a parallel path) or multiple contours around a shape with a continuous (open or closed) boundary.
2.2
radial lock
This command locks the drawing cursor to given angle steps e.g. 45 degrees.
Tools and Equipment
2.3 dimension tool
2.4 delete part tool
2.5 boundary fill
2.6 ABC tool
2.7 edit mode toolbox
Use this command to dimension an object.
Delete part of an object between two intersections Use this command to fill a closed boundary with colour. Use this command to draw linear text.
Use this command to start Edit Mode.
2.8
attach tool
Tool to attach the drawing cursor to a range of possible points, e.g, end point.
vacuum former
169