Technology Notes Flashcards
What are the three categories of matter?
Conductors, Semiconductor and Insulators
What is conductor?
Substances that permit the flow of electrical charges
What is Semiconductor?
Substances of variable conductivity depending on several factors
What is Insulator?
Substances that delay the flow of electric current.
What is Conductance?
The capacity of material allowing electricity to flow through them
As the length increases, conductance_____
Decreases
As the diameter increases, conductance_____
Increases
As the temperature of the wire increases conductance____
Decreases
What is Power Supply?
The ability to provide energy to electrical current in a circuit
What is “protection”?
Allows the safe use of electrical circuits and appliances when they are under a power surge
What is “Transformation”?
The ability of circuit elements to transform electrical energy into other useful forms of energy.
What is “Control?”
Allows the circuits to be easily turned on and off
What is “Constraint”?
Constraint are external forces that are exerted on materials and that have a tendency to deform them.
What is Motion transmission?
Relaying a motion from one part to another without altering the nature of the motion.
What does a motion transmission system contain?
- a driver component
- a driven component
- Intermediate component
What are the Characteristics of motion transition system
- They all transmit Rotational motion
- the direction is clockwise or counterclockwise
- If reversible then the driven component can be a driver (vice versa)
Characteristics of Gear Trains?
- Contains at least two gears
- Direction alternates from one gear to another
- Gears are reversible
Characteristics of chain and sprocket?
- Connected with chain
- 2 sprocket move in the same direction
- reversible
Characteristics of Worm and Gear?
- Irreversible
- The driver must be the WORM
- the gear teeth match the grooves of worm
Named all the Motion that can be reverse (clockwise & counter clockwise)
- Rack and Pinion
- Slider-Crank mechanism
- Belt and Pulley
- Gear Train
- Chain and sprocket
- Simple Gear system
When do Speed changes occur?
When the driver does not turn at the same speed as the driven component.
What is Hardness?
To resist force, abrasion (scratches) or deformation
What is Elasticity?
The capacity to return to its original shape after undergoing a constraint
What is Resilience?
Capacity to resist shock by undergoing deformation and then turning to its original shape.
What is Fragility?
Capacity to break without undergoing deformation when subjected to various constraints
What is stiffness?
Capacity to retain their shapes when subjected to various constraints
What is Ductility?
Shaping property usually associated with metals capacity to be drawn into. Wires without breaking
What is Maleability?
Shaping property (usually associated with metals )capacity to be flattened or bent without breaking
