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U d 2
  (37.8)
I 4 l 

Fig. 37.1 shows a schematic diagram of a laboratory installation
for Ohm's law verification and determination the specific resistance of

a conductor.

Figure 37.1

Installation scheme for checking the Ohm law and determining
of the specific resistance of a conductors
In this scheme, the explored conductor AC is connected to a
current source through a rheostat. The contact (slider) is moving on

the conductor C. The voltage at the ends of the section AC is
measured by a voltmeter, and the current is measured by an ammeter.

The length of this section of the AU is determined by a scale ruler.
Ohm's law verification is to study the dependence of the current
strength on the voltage at its ends for conductors of different
resistance (of different lengths).

When performing the work, experimental data both for Ohm’s
law verification and for determination of the specific resistance of the
conductor are obtained simultaneously.

3. Sequence of work performance.
1. Collect an electric circuit in accordance with the principal
diagram of figure 37.1. In this case, the rheostat is included in the

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