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Engineering (Overview of major subfields (Electrical Engineering (Power…
Engineering
Overview of major subfields
Electrical Engineering
Power and light
Computer engineering
Telecommunication
Civil Engeering
City Planning
Chemical Engineering
Mechanical Engineering
Steam Engine
Bioengineering
Thermodynamics and engines
Law of Conservation
Conversion - describes how much of initial input was used in the process
Steady state
Yield - final product harvested
Accumulation: Input - Output + Generation - Consumption
Reservsibility & Irreversibility
2 main types of energy
Heat - Q
Work - W = Force (F) * Distance (D)
e.g. Pressure Volume Work (expansion and compression of matter)
Compression means positive work (W) on matter
Expansion means negative work (-W)
Shaft Work - rotation
Electrical Work - work done on a charged particle by an electric field e.g. discharge from a battery
Measurement
Efficiency = Output/Input
Thermodynamics
branch of physics and engineering that focuses on converting engergy
zeroth law of thermodynamics
focus on temperature and equilibrium
energy
Kinetic energy (KE)
translational kinetic energy
Rotational kinetic energy
Vibrational kinetic energy
potentional energy (PE) aka stored energy
e.g. gravitional PE
horizontal PE (a bow transforms PE to kinetic energy)
Interal energy (U)
In Closed systems
Heat + Work = ΔU + ΔKE + ΔPE
In Open System
Enthalpy (H) includes internal energyt but also adds in the energy required to give a system its volume and pressure
Origin
Latin ingenium (n) cleverness
Latin ingeniere (v) to invent