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--- lab_electrical_engineering:1_resistors:resistance-measurement [2026/03/10 03:16] – created mexleadmin
+++ lab_electrical_engineering:1_resistors:resistance-measurement [2026/03/16 01:08] (current) – mexleadmin
@@ Line 1: / Line 1: @@
-==== Resistance measurement ====
+====== 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:
   * **direct** resistance measurement
   * **indirect** resistance measurement
@@ Line 13: / Line 13: @@
 === 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>Table-1_V2.png}}
+{{drawio>lab_electrical_engineering:1_resistors:Table-1_V2.svg}}
 <tabcaption Table-1_V2 | Direct resistance measurement> </tabcaption>
 \\
+\\
+\\
+\\
 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?
-<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> \\
-{{drawio>Table-2_V1-Serial+parallel.png}}
+$R_{\rm series} = R_{\rm a} + R_{\rm b}$ \\
-<tabcaption Table-2_V1 | Series and parallel connections> </tabcaption>
+$R_{\rm parallel} = R_{\rm a} \parallel R_{\rm b} = \frac{R_{\rm a} \cdot R_{\rm b}}{R_{\rm a} + R_{\rm b}}$
+{{drawio>lab_electrical_engineering:1_resistors:Table-2_V1-Serial+parallel.svg}}
+<tabcaption Table-2_V1 | Series and parallel combinations> </tabcaption>
 \\
 \\
 === 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>Fig-1_V1-indirect-measurement.png}}
+{{drawio>lab_electrical_engineering:1_resistors:Fig-1_V1-indirect-measurement.svg}}
 <imgcaption Fig-1_V1 | Indirect resistance measurement> </imgcaption>
+\\ \\
+Measure $U_{\rm n}$ and $I_{\rm n}$. Calculate $R_{\rm n}$ from these values.
-Measure $U_{\rm n}$ [V] and $I_{\rm n}$ [mA]. Calculate $R_{\rm n}$ [k$\Omega$] from these values.
+{{drawio>lab_electrical_engineering:1_resistors:Table-3_V1-indirect-measurement.svg}}
+<tabcaption Table-3_V1 | Indirect resistance measurement> </tabcaption>
-{{drawio>Table-3_V1-indirect-measurement.png}}
-<tabcaption Table-3_V1 | Indirect resistance measurement> </tabcaption>