Verify The Kirchhoff’s Current Law And Voltage Law (practical)

In this post I'm verifying kirchoff's different law for trade practical

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Verify the Kirchhoff’s current law with two branch currents

Requirments

1. Connect the PSU, milliammeters, SPST switch and resistors as illustrated in the schematic circuit and the layout diagram as shown in flag

   

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2. Switch ‘ON’ PSU and set output to 12 volts.
3. Simplify the circuit in Fig 1 and calculate the theoretical total circuit current and branch currents of the circuit for a set DC supply of 12 volts. Record values in Table 1.
4. Get the circuit connections checked by your instructor.
5. Switch ON SPST.
6. Measure and record the total circuit current (IT) and branch currents IS1 and IS2 in Table 1.
7. Switch OFF the SPST.
8. Set the output of the RPSU to 9 volts.
9. Calculate the theoretical circuit currents for the set supply voltage of 9V.
10. Record values in Table 1.
11. Repeat steps 4 and 6.
12. Switch OFF SPST and PSU.
13. Write Kirchhoff’s current equations for the nodes P and Q.
14. Verify the equation substituting the measured current values.

Precautions

Keep the SPST and PSU in the OFF position while making circuit connections.

Check if the connected ammeters can measure the calculated current. Change the meter, if necessary.

Verify the Kirchhoff’s current Law with three branch currents

1. Make circuit connections on the lug board as per the schematic circuit in Fig 2. 
   
   
   
2. Get the wired circuit checked by your instructor.
3. With the SPST in OFF position, set the output of PSU to 12 volts.
4. Switch ON the SPST switch. Measure and record currents IT , IB1 , IB2 and IB3 in Table
   
5.  Switch OFF SPST and PSU.
6. Write Kirchhoff’s current equations at nodes P and Q.
7. Verify the equation using measured current values.
8. Get the readings and equations checked by your instructor
9. Record your findings and conclusions after verifying the recorded and calculated values and check if it is same as per the theoretical conclusions.

Precautions

Make it a practice to keep the SPST and PSU switches in the OFF position while making circuit connections.

Verify the Kirchhoff’s voltage Law with one voltage source

1. Measure and record in Table 3, values of resistors R4 , R5 and R6 soldered on the lug board.
2. Make the circuit connections as shown in Fig 3.
   
3. Mark the polarity of the voltage drops across resistors R4 , R5 and R6 in the copy of Fig 3.
4. Get the circuit connections and polarities marked and checked by your instructor.
5. Switch ON PSU and set output to 12V. Switch ON SPST. Following the voltage polarities marked across the resistors, measure and record the drop in voltage across resistors R4 , R5 & R6 in Table 3. 
   
6. Switch OFF SPST and PSU.
7. Write Kirchhoff’s loop equations for the closed paths a- c-d-b-a, a-e-f-b-a and c-e-f-d-c. Substitute the voltage readings recorded in Table 3 in the equations for verification.
8. Get your readings and equations checked by your instructor

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