Name
Date
Pd
CASTLE Unit 5 - Worksheet 1
Draw starbursts on the bulbs in the figures below that show the brightness of each bulb at the
various stages in Activity 1. Draw arrow tails that show the directions and rates of flow that
cause the observed brightness. Color-code the wires to provide a picture of the pressure
differences that cause these flows.
At the instant of connection:
a
R
How does the flow rate at point a) compare to the
b
flow rate at point b)?
R
How does the flow rate at point c) compare to the
flow rate at point d)?
d
R
c
R
Instant of connection
R
R
What causes the pressure in the top right and
bottom right wires to change?
Mid-way through the transient:
What has happened to the pressure difference
across the 1st and the 4th bulbs?
What has happened to the flow rates through the 1st
and 4th bulbs?
R
R
Midway through transient
What has happened to the pressure difference
across the 2nd and the 3rd bulbs?
What has happened to the flow rates through the 2nd
and 3rd bulbs?
R
R
Final Steady State:
How did the capacitor slow down the transient?
Explain in terms of the wires, capacitor plates,
compression and electric pressure:
R
R
Final, steady state
©Modeling Workshop Project 2004
1
C5 WS 1 v3.2