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Model No. ES-9080
Basic Electrostatics System
11
Conductive Spheres (ES-9059B)
The conductive spheres are used to store
electrical charge. The PASCO Model
ES-9059B spheres are composed of
plastic resin mold plated with a copper
base, outer plating of non-sulphur brite
nickel, with final plating of chrome. The
spheres are mounted on insulting
polycarbonate rods, attached to a support
base. Each sphere has a thumb-nut on the
lower half that can be used for attaching
a ground cable or a lead from a power
supply. The sphere and insulating rods
should be kept free of dirt, grease, and
fingerprints to minimize charge leakage
from the sphere.
Resistor-Capacitor Network Accessory (ES-9053)
The Resistor-Capacitor Network is an optional accessory that you can
purchase from PASCO.
Three resistors (50 M
:
, 100
M
:
, and 200 M
:
) and two
capacitors (0.47
P
F and .94
P
F)
are wired into a switching
network which permits the
components to be connected in
various configurations. The RC
Network is designed for the
study of RC time constants and
for investigating capacitors
connected in series and parallel
(the RC time constants range from 25 to 200 seconds). A third
capacitor (0.22
P
F) can be selected in series or parallel with the other
two capacitors.
On the front of the RC Network, a diagram shows the connection of
the components. The positions of the three slide switches indicate the
exact components being used. Figure 11 shows the front panel of the
RC Network with the slide switches in various positions. The three-
position slide switch on the left has a very useful “Open” position. It is
often convenient to stop the charging process when making a
measurement, and the “Open” position permits the circuit to be
disconnected from the power supply.
Figure 10:
Conductive Sphere
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Figure 11: Resistor-Capacitor
Network
IMPORTANT: Never
place more than 50 VDC
across any component in
the RC Network.