Figure 1-3.
Slide wire potentiometer
Learning Event 4:
DESCRIBE THE TWO-RANGE POTENTIOMETER
1.
A simplified circuit of a two-range potentiometer is shown in Figure
1-4. Selection of either the 1.6 or .16-volt range is provided by switch
S1.
As in the single-range instrument, the rheostat adjusts the working
battery circuit to the proper voltage. The standard cell Es and the unknown
EMF Ex are connected by means of switch S3. The galvanometer (G) is shown
with its protective resistance Rp and shunting switch S2.
For the high
range, the dials may be read directly; for the low range, the dial readings
are multiplied by the factor .1.
5
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