DW EditShow pageOld revisionsBacklinksAdd to bookExport to PDFFold/unfold allBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ==== Mesh set ==== \\ **In every closed circuit and every mesh of the network, the sum of all voltages is zero!** \\ Set the voltage on the power supply to $12~\rm V$ and measure this voltage precisely using a multimeter. Set up the measuring circuit shown in <imgref Fig-2_Mesh-set_V1>. {{drawio>lab_electrical_engineering:1_resistors:Fig-1_Mesh-set_V1.svg}}\\ <imgcaption Fig-2_Mesh-set_V1 | Mesh-set> </imgcaption> Add the voltage arrows and measure $U$, $U_{\rm 1}$ und $U_{\rm 2}$: {{drawio>lab_electrical_engineering:1_resistors:Table-1_Mesh-set_V1.svg}}\\ <tabcaption Table-4_mesh-set_V1 | Mesh set voltage mesurement> </tabcaption> What is the mesh set here? <wrap onlyprint>\\ \\ \\ \\ </wrap> Check the formula with the measured values: <wrap onlyprint>\\ \\ \\ \\ </wrap> The resistors $R_{\rm 1}$ and $R_{\rm 2}$ connected in series form a voltage divider. What is the ratio between the voltages $U_{\rm 1}$ and $R_{\rm 2}$? $$ \frac{U_1}{U_2} = $$ ==== Set of nodes ==== \\ **At each junction point, the sum of all incoming and outgoing currents is equal to zero!** \\ Set the voltage on the power supply to $12~\rm V$ and measure the voltage accurately with a multimeter. In the first step, set up the measuring circuit shown in <imgref Fig-3-Node-set-1_V1>: {{drawio>lab_electrical_engineering:1_resistors:Fig-3_V1-Node-Set-1.svg}} <imgcaption Fig-3-Node-set-1_V1 | Node-set circuit 1> </imgcaption> Draw the arrows for the directions of currents $I_{\rm 1}$ and $I_{\rm 2}$ in <imgref Fig-4-Node-set-2_V1>. The DC current measurement range must be set on both multimeter using the rotary switch. Then measure currents $I_{\rm 1}$ and $I_{\rm 2}$ and enter the measured values in <tabref Table-5_Node-set_V1>. {{drawio>lab_electrical_engineering:1_resistors:Fig-4_V1-Node-Set-2.svg}} <imgcaption Fig-4-Node-set-2_V1 | Node-set circuit 2> </imgcaption> What is the relationship between currents $I_{\rm 1}$ and $I_{\rm 2}$? $$ \frac{I_1}{I_2} = $$ Switch the power supply back on and measure the current $I$. Enter its value in <tabref Table-5_Node-set_V1>. {{drawio>lab_electrical_engineering:1_resistors:Table-5_Node-set_V1.svg}}\\ <tabcaption Table-5_Node-set_V1 | Node set current mesurement> </tabcaption> Determine the node set for node K and check its validity.\\ \\ Using the measured values for resistors $R_{\rm 1}$, $R_{\rm 2}$, and $R_{\rm 3}$, calculate the total resistance $R_{\rm KP}$:\\ \\ Using the calculated value $R_{\rm KP}$, check the measured value of the total current:\\ $$ I=\frac{U}{R_{KP}} = $$ CKG Edit