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Technology Junior Cert - Coggle Diagram
Technology Junior Cert
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Mechanisms
A rack and pinion transfers rotary motion to linear motion.It is a precise transfer of motion but is not very durable
Bevel Gears transfer motion at 90*, there is no change in speed during the transfer
Worm and Wheel-transfers motion at 90*, it is strong and compact but it slows the input speed
Electronics
Switches.
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Push to make.When the button is pressed electricity is flowing, when it is released the circuit is broken
Sensors
LDR-Light Dependant Resistor.The more light shining on the resistor,the less electricity is flowing and vice versa
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L.E.D's
Light Emitting Diodes emit light when there is current flowing through. It transfers electrical energy to light energy
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Materials
Plastic
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Perspex
Perspex is cheap,brittle, easy to shape , bend and create shapes with
Metal
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non-ferrous eg.copper,They contain iron.Metals are strong,ductile,fusible,hard ,shiny and malleable
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Wood
Wood is a hard, fibrous material commonly found in the trunk of trees
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Textiles
A textile is a type of woven fabric or cloth.There are two types of fibers natural and synthetic. Natural fabrics eg. leather and silk are soft and durable but more expensive.Synthetic fibers eg. nylon are strong and thermal conductors
Target Market
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no under 10's because of electronics, moving parts and chocking hazards
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