Advertisement
Battery tester
YOU WILL NEED
+ 2 resistors, 470 Ω
+ 1 resistor, 22 kΩ
+ 1 resistor, 220 kΩ
+ 1 red LED
+ 1 Transistor module
+ 1 short wire bridge
+ electronics board
+ battery clip
+ and additional household
item: 9-volt square battery
HERE'S HOW
1. Assemble your battery tester.
2. Connect the battery.
Does the LED really light up or just
glimmer a little?
R 1
R 3
220 k
470
R 2
22 k
R2 22 kΩ
LED 1
R 4
470
+
9V
–
T1
Sensors & Detectors
LED1
A
C
R4
R1
R3
220 kΩ
470 Ω
470 Ω
T1
43
EXPERIMENT 18
+
–
Advertisement
