Data Sheet
-26-
28. Conductivity Tester
By using this circuit, we can identify which materials in
our daily life are conductors, and which are insulators.
Connect the testing item across points A (using the
hook from the maze (37)) and B (using the pin on the
bottom of the spring wire (9)). If you see the lamp (76)
on, the tested item can be considered a conductor.
Otherwise, it can be considered an insulator.
29. ldentication of Polarity of the Power
Build the circuit and connect the battery module (91)
across points A and B. You will only light up the Heart
LED (69). But if you install the battery reversely across
points C and D, you will light up the star LED (70). This
circuit could be used to test the polarity of a battery. If
the heart LED (69) comes on, it can be concluded that
point A is the anode (+ side of the battery) and point B
is cathode (– side of the battery). If the star LED (69)
comes on, it can be concluded that point D is the anode
(+ side of the battery) and point C is cathode (– side of
the battery).