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Experiment
Use this circuit to easily check whether an electrolytic capacitor in the range of 1 uF to 100 μF is working
properly. Install the unknown electrolytic capacitor and watch the behaviour of the instrument's needle.
You should test both polarization directions. If the electrolytic capacitor is reverse biased, the needle will
swing briefly and return to zero. If forward biased, the needle shows a more or less strong deflection. This
behaviour shows that the capacitor is working. If in both cases, the needle moves and returns to zero or
shows a deflection, then the electrolytic capacitor is faulty. Besides electrolytic capacitors, you could also
test tantalum capacitors
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.216.
2.102 Generating hydrogen
Circuit 217: Generating hydrogen
Setup information
Install the resistor and the jumper as shown in Fig. 2.217. Then connect the moving-coil instrument. We will
use two wires with bare ends as electrodes, which we dip in a glass filled with water. Check the placement
on the board again and only then connect the battery.
Components required:
1 x 2.2 kΩ resistor,
1 x moving-coil instrument,
1 x breadboard, 1 x 9V bat-
tery with clip connector
Fig. 2.216: Capacitor test with
moving-coil instrument
241
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