Created by Ed Twentyman
Overview, Topic and connections in SQA National 5 Engineering Science Course
Definition Electrical & Electronic Engieering
Current, Voltage and Resistance.
Power
Ohms Law
Datasheet formula and their use
Circuit Symbols
Resistor colour code
Series and Parallel Circuits
Series and parallel resistor networks
Circuit Laws
Types of Engineer and typical tasks.
Environmental
Civil
Structural
Mechanical
Chemical
Electrical
Electronic
Examples of Applications of
Varied roles
Contributions from many branches of engineering to solve varies challenges.
SPST
SPDT, etc.
Relay and transistor function
Describing how transistor switching circuits work!
Input devices - reading values from thermistor/LDR graphs
Examples of
System and sub-system diagrams
Input - Process - Output
Open Loop & Closed Loop control
An engineers view on very new "EMERGING" technology and its impact… Social, Economic & Environmental
Conservation of Energy
Energy Transfers, losses and transformations
Energy Audits and calculation of efficiency
Calculations of kinetic, potential, electrical and heat energy using formulae (see data book)
Calculations involving efficiency, power, and work done.
Ew = F x d
P = E/t
Ek = ½mv²
Ep = mgh
Ee = IVt
Eh = mc(T2-T1)
Efficiency = Eout/Ein or Pout/Pin
Energy transfers
Kinetic vs Potential Energy stores
Datasheet!!!
Functions
Symbols
Truth tables
What is Mechanical engineering
Roles of mechanical engineer
truth tables
Advantages and disadvantages
Programming and flowcharts
Linear
Rotating
Reciprocating
Oscillating
Fossil Fuels and Renewables
Renewable energy generation
Greenhouse effect - causes
Conservation of resources / Carbon debt
Calculations using Energy, power and efficiency formulae - see data book
Significant figures and standard notation
Units and prefixes
Energy Transfer and Loss
Energy Audit & Sankey diagram
symbols - see datasheet
loops
links to microcontroller pin numbers!
increment variable in loop
arduino and pbasic
deriving Boolean expression from truth table
deriving series of logic gates from truth table
Simple vs compound gears
Idler gear
Types of gearing - worm and wheel, rack and pinoin, etc.
Friction
Bearings & lubrication
teeth x rev speed = teeth x rev speed
Datasheet formulae
Yenka gears
Components - valves, cyclinders, actuators, shuttle valve, restrictor, time delay, manifold
Semi automatic
fully automatic circuits
AND and OR functions using valves
Describing operation of circuit from input to output
Role of structural engineer
Structures!
Force = Pressure * area
Area of cylinder piston (pi x d²)/4
Difference in area when instroke vs outstroke on double acting cylinder.
velocity ratio = input speed/output speed
datasheet
Material properties and appropriateness for design requirement
Loads on members
Loads on Nodes
Free body diagrams
Torque calculations
Push / Pull
Compression / Tension
Strut / Tie
Stress / Strain - see datasheet
Torque = Force * radius
Moments
Selecting appropriate materials for application (with justification)
Calculating stress using force and area
Calculating Strain using extension and length
see datasheet
Stress (sigma) = force/area [N/m² or N/mm²)
Strain (epsilon) = extension/original length [no unit]
Definition
Adding/subtracting vectors at angles
Scale diagrams
Concurrent systems - triangle of vectors
Free body diagrams
Torques and Moments
Conditions for Equilibrium