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lab_electrical_engineering:1_resistors:resistance-measurement [2026/03/10 03:43] – mexleadminlab_electrical_engineering:1_resistors:resistance-measurement [2026/03/16 01:08] (current) – mexleadmin
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-==== Resistance measurement ==== +====== Resistance measurement ====== 
- +
 Procedure for resistance measurement: Procedure for resistance measurement:
-  -  Set the measuring device to 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 $\Omega$ +  - Connect the resistor to be measured to the corresponding sockets on the measuring device (the sockets labelled COM and $\Omega$). 
-  -  Read the measured value +  - Read the measured value.
  
-There are different types of resistance measurement:  +There are different types of resistance measurement: 
-  * **direct** resistance measurement +  * **direct** resistance measurement
   * **indirect** resistance measurement   * **indirect** resistance measurement
  
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 === Direct 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.+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 hand to your left hand.
  
 {{drawio>lab_electrical_engineering:1_resistors:Table-1_V2.svg}} {{drawio>lab_electrical_engineering:1_resistors:Table-1_V2.svg}}
-<tabcaption Table-1_V2 | Direct resistance measurement> </tabcaption>     +<tabcaption Table-1_V2 | Direct resistance measurement> </tabcaption> 
-\\ +\\ 
 +\\ 
 +\\ 
 +\\
  
 How do you explain the deviation between $R_{\rm L,nominal}$ and $R_{\rm L,meas}$? How do you explain the deviation between $R_{\rm L,nominal}$ and $R_{\rm L,meas}$?
-<wrap onlyprint> \\ \\ \\ \\  </wrap>\\+ \\ \\ \\ \\ 
 \\ \\
 \\ \\
 +
 What consequences can $R_{\rm K}$ have? What consequences can $R_{\rm K}$ have?
-<wrap onlyprint> \\ \\ \\ \\  </wrap>\\+ \\ \\ \\ \\ 
 \\ \\
 \\ \\
-Now determine the series and parallel connections of resistors $R_{\rm 1}$, $R_{\rm 2}$ and $R_{\rm 3}$. \\ 
-Specify the formulas used: \\ 
  
-$R_{\rm serial}$ =  \\ +Now determine the series and parallel combinations of resistors $R_{\rm 1}$, $R_{\rm 2}$ and $R_{\rm 3}$. \\ 
-<wrap onlyprint> \\ \\  </wrap> \\ +State the formulae used: \\ 
-$R_{\rm parallel}$ (= $R_{\rm a}$ || $R_{\rm b}$) = + 
-<wrap onlyprint> \\ \\  </wrap> \\+$R_{\rm series} = R_{\rm a} + R_{\rm b}$ \\ 
 +$R_{\rm parallel} = R_{\rm a} \parallel R_{\rm b} = \frac{R_{\rm a} \cdot R_{\rm b}}{R_{\rm a} + R_{\rm b}}$
  
 {{drawio>lab_electrical_engineering:1_resistors:Table-2_V1-Serial+parallel.svg}} {{drawio>lab_electrical_engineering:1_resistors:Table-2_V1-Serial+parallel.svg}}
-<tabcaption Table-2_V1 | Series and parallel connections> </tabcaption> +<tabcaption Table-2_V1 | Series and parallel combinations> </tabcaption>
 \\ \\
 \\ \\
 +
 === Indirect resistance measurement === === Indirect resistance measurement ===
 \\ \\
-The resistances can also be determined by measuring the current/voltage.+Resistance can also be determined by measuring current and voltage.
  
-**Ohm's law: In an electrical circuit, the current increases with increasing voltage and decreases with increasing resistance.** \\  +**Ohm's law:** In an electrical circuit, the current increases with increasing voltage and decreases with increasing resistance. \\ 
-$$ I=\frac{U}{R} $$+$ I = \frac{U}{R} $
  
-Build the measuring circuit shown in <imgref Fig-1_V1> for each of the three resistors and set the voltage on the power supply to $~{\rm 12} ~{ V}$.+Build the measurement circuit shown in <imgref Fig-1_V1> for each of the three resistors and set the voltage on the power supply to $12 ~{\rm V}$.
  
 {{drawio>lab_electrical_engineering:1_resistors:Fig-1_V1-indirect-measurement.svg}} {{drawio>lab_electrical_engineering:1_resistors:Fig-1_V1-indirect-measurement.svg}}
 <imgcaption Fig-1_V1 | Indirect resistance measurement> </imgcaption> <imgcaption Fig-1_V1 | Indirect resistance measurement> </imgcaption>
- +\\ \\ 
-Measure $U_{\rm n}$ [V] and $I_{\rm n}$ [mA]. Calculate $R_{\rm n}$ [k$\Omega$] from these values.+Measure $U_{\rm n}$ and $I_{\rm n}$. Calculate $R_{\rm n}$ from these values.
  
 {{drawio>lab_electrical_engineering:1_resistors:Table-3_V1-indirect-measurement.svg}} {{drawio>lab_electrical_engineering:1_resistors:Table-3_V1-indirect-measurement.svg}}
-<tabcaption Table-3_V1 | Indirect resistance measurement> </tabcaption>    +<tabcaption Table-3_V1 | Indirect resistance measurement> </tabcaption>