Thames & Kosmos Electronics - Electronic sensors

EXPERIMENT 

Electronic
sensors
YOU WILL NEED
  resistors,  Ω
  red LED
  transistor modules
  short wire bridges
  long wire connector
 electronics board
 battery clip
 and additional household
item: 9-volt square battery
Your LED will flicker.
When you rubbed your
feet against the floor,
your sensor detected an
electrical field created by
static electricity.
 WHAT’S UP?
HERE’S HOW
1. Assemble the components as
shown in the circuit diagram. At
terminal B, insert a long wire
vertically, like an antenna.
2. Make an “O” with your thumb and
forefinger, and lower this “O” over
the antenna without touching it.
Shuffle or rub your feet a few times
against the floor.
Do you notice anything?
+
–
9V
T2
A
B
T1
R 2
470 Ω
R 1
470 Ω
LED 1
Tip
This experiment will work best
in a room with a carpet or
plastic flooring.
LED1
T2
T1
+
–
A C
R
 Ω
R
 Ω
A
B