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Conductivity
tester
YOU WILL NEED
+ your humidity detector
+ and additional household
items such as a key, eraser,
coin, pencil, toys
HERE'S HOW
1. Get the items ready that you will
want to test.
2. Hold the two bare ends of the long
wires of your humidity detector up
to the key, eraser, coin, etc.
R1
220 kΩ
R3
470 Ω
T1
R4
R2
22 kΩ
100 kΩ
Conductance
EXPERIMENT 3
+
LED2
A
A
C
–
LED1
C
R6
470 Ω
R5
T2
3.3 kΩ
19
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