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eee1_lab:resistance-measurement

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Resistance measurement

Procedure for resistance measurement:

  • Set the measuring device to resistance measurement
  • Connect the resistance to be measured to the corresponding sockets on the measuring device (the measuring device sockets labeled COM and $\Omega$
  • Read the measured value

There are different types of resistance measurement:

  • direct resistance measurement
  • indirect resistance measurement


Direct resistance measurement


Determine the nominal and measured values of the resistance for $R_{~\rm 1}$ (brown, green, orange), $R_{~\rm 2}$ (yellow, violet, red), $R_{~\rm 3}$ (red, violet, red) and the incandescent lamp $R_{~\rm L}$. Also measure the approximate resistance $R_{~\rm K}$ of your body from your right to your left hand.

eee1_lab:table-1_v2.png

Tab. 1: Direct resistance measurement


How do you explain the deviation between $R_{~\rm L,nominal}$ and $R_{~\rm L,meas}$?






What consequences can $R_{~\rm K}$ have?






Now determine the series and parallel connections of resistors $R_{~\rm 1}$, $R_{~\rm 2}$ and $R_{~\rm 3}$.
Specify the formulas used:

$R_{~\rm serial}$ =



$R_{~\rm parallel}$ (= $R_{~\rm a}$ || $R_{~\rm b}$) =


eee1_lab:table-2_v1-serial_parallel.png

Tab. 2: Series and parallel connections



Indirect resistance measurement


The resistances can also be determined by measuring the current/voltage.

Ohm's law: In an electrical circuit, the current increases with increasing voltage and decreases with increasing resistance.

$$ I=\frac{U}{R} $$

Build the measuring circuit shown in figure 1 for each of the three resistors and set the voltage on the power supply to $~{\rm 12} ~{ V}$.

eee1_lab:fig-1_v1-indirect-measurement.png Fig. 1: Indirect resistance measurement

Measure $U_{~\rm n}$ [V] and $I_{~\rm n}$ [mA]. Calculate $R_{~\rm n}$ [k$\Omega$] from these values.

eee1_lab:table-3_v1-indirect-measurement.png

Tab. 3: Indirect resistance measurement
eee1_lab/resistance-measurement.1772985734.txt.gz · Last modified: 2026/03/08 17:02 by mexleadmin · Currently locked by: 192.168.48.6,216.73.216.142