Bathtub Water Level Model
-
Upload
ahmed-carson -
Category
Documents
-
view
44 -
download
2
description
Transcript of Bathtub Water Level Model
Bathtub Water Level Model
Cloud – input/output that doesn’t affect model
Converter – constant used within the model
Flow – causes conditions to change
Stock – tells what conditions are
Link – connects two parts of a model
Key to Symbols
Water Supply
Water LevelSewer
Faucet Drain
Water pressure “Cloggage”
Compound Interest Model
Cloud – input/output that doesn’t affect model
Converter – constant used within the model
Flow – causes conditions to change
Stock – tells what conditions are
Link – connects two parts of a model
Key to Symbols
Interest Rate
Earning InterestBank Balance
The R means that this is a self-reinforcing or “positive” feedback loop which makes the result exponential
R
Compound Interest ModelCan be represented by a relatively simple equation
Where:A – Final amountP – Principle amountr – Interest Ratet – Time (years)
Can also be shown graphically
Rule of thumb:10X more CPUfor a doubling ofresolution
Increased Resolution RequiresIncreased Computing Resources
1980’s
1990’s2000’s
Sources• Slide 1 and 2
– “An Introduction to Systems Thinking”, High Performance Systems, Inc.• Slide 3
– http://www.crackerjackgreenback.com/the-basics/compound-interest-a-lesson-from-benjamin-franklin/
• Slide 4– http://co2now.org/Know-the-Changing-Climate/Climate-System/ipcc-faq-clim
ate-change-weather.html
• Slide 5– http://www.atmosp.physics.utoronto.ca/people/guido/research.html
• Slide 6– http://serc.carleton.edu/eslabs/weather/5c.html
• Slide 7– http://serc.carleton.edu/eet/envisioningclimatechange/teaching_notes.html