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Circuit 2: Extending the measuring range
Setup information
Install the resistor and then the jumper as shown in Fig. 2.2. 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 working properly; the needle will move and stop roughly in the middle of the scale. Again, this
is a voltage measurement.
The resistor uses more or less half of the battery voltage. Circuit 1 has two resistors in parallel. Thus, the
current flow was twice as much using only half as much voltage.
You could use a greater resistor connected in series with the moving-coil instrument, for example, to
increase the voltage measurement range.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.2.
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Components required:
1 x 10 kΩ resistor,
1 x moving-coil instrument,
1 x breadboard, 1 x 9V bat-
tery with clip connector
Fig. 2.2: Extending the measur-
ing range
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