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 Level Sewe r Fauc et Drai n Water pressure “Clogga ge”
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Bathtub Water Level Model Cloud – input/output that doesn’t affect model Converter – constant used within the model Flow – causes conditions to change.
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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