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Circuit 5: Current measurement with a small shunt resistance
Setup information
Install the four resistors and then the jumper as shown in Fig. 2.5. Connect the moving-coil instrument.
Check the placement on the board again and only then connect the battery.
Experiment
Once the battery is connected, the moving-coil instrument will deflect. What is the scale of the deflection?
If everything is fine, the needle will move about two thirds. Unlike the previous experiment, here the instru-
ment is connected in parallel with the series connection of the two 220 Ω resistors. Part of the current flow
– approximately one third – is now diverted by these resistors and will no longer flow through the meter. By
that we have increased the current measurement range of a moving-coil instrument.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.5.
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Components required:
2 x 10 kΩ resistors,
2 x 220 Ω resistors,
1 x moving-coil instrument,
1 x breadboard, 1 x 9V bat-
tery with clip connector
Fig. 2.5: Current measurement
with a small shunt resistance
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