Verification of Kirchhoff’s Voltage Law,Lab Experiment,KVL

In this Video we will Demonstrate the little theory of KVL, How to patch the circuit on breadboard, How to connect the power supply and setting up the Multimeter, How to measure Voltage & Approve the Kirchhoff’s Voltage Law Experiment with equation. Lab Manual/Lab Report is also given below. Watch the given videos and real the Lab report, If you have any question feel free to ask by commenting section.

KVL Lab Experiment Video:

KVL Lab Report:

Objective:

                  Verification of Kirchhoff’s Voltage Law Lab Experiment

See Also:Electronics Lab Verification of Ohm’s Law Experiment

 Discussion:

Electronics components are not always connected in a clear-cut series or parallel or series-parallel arrangement. Instead, the circuit connections may be more complex. As an example, unbalanced wheatstone bridge circuit cannot be analyzed using the simple methods of series-parallel analysis, as there are no clear-cut series, parallel connections. For this type of circuit, a more general method of analysis is required.

See Also:To be Familiar with Oscilloscope and Function Generator Labs

Basically, applying Kirchhoff’s laws can solve any circuit, no matter how complex. The reason is that Kirchhoff’s laws do not depend on series or parallel connections. There are two laws annunciated by Kirchhoff’s, called Kirchhoff’s voltage law or KVL and Kirchhoff’s current law or KCL.

See Also:How to Test a Diode Using Multimeter & Identify Anode and Cathode of Diode

In this experiment we study the Kirchhoff’s voltage law, generally abbreviated as KVL. This law states that the sum of the voltage sources and Ir drops around any closed path must equal Zero. Any closed path is called a loop. When adding voltages in a closed Path, if you start from any point at one potential and come back to the same point and the same potential, the difference of potential must be zero. When determining the algebraic signs for  the voltage terms in a closed path, consider any voltage source or     drop whose   positive terminal is reached first as positive, and any voltage source or whose negative terminal is reached first as negative.

See Also:How to use a Breadboard, Electronic Breadboard Tutorial:

Apparatus:

  • Three isolated D.C Power Supplies

Vs1=12v;Vs2=15;Vs3=30

  • Dc Voltmeter 0-50v
  • Resistors: AB=100 CD=56 EF=82 GH=JA=100
  • Bread Board
  • Jumper Wires

See Also:How to find Value of Resistor by Color Coding Resistor Color Coding Tutorial

Procedure:

  1. Construct the circuit shown in the figure
  2. Close switch de
  3. Commence at point a and measure the potential difference between each successive pair of lettered terminal
  4. Note in each case whether the potential difference measured represents a rise or a fall in potential.
  5. Open switch de.
  6. Commence at point and repeat the procedure of part. 

Draw a graph set of axes with abscissa uniformly scaled to represent the lettered points of the circuit. Commence and finish with the letter a. the ordinate is to represent positive and negative potentials.

See Also:How to Measure Voltage, Resistor, Current & Continuity using a Multimeter

Analysis, Deductions and conclusion:

  • Has Kirchhoff’s voltage been verified?
  • What facts determined from the experimental result support this decision?
  • It is correct to say that in any closed loop in a circuit there is a much voltage rise as there is voltage fall?
  • Do voltage fall occur always and only over resistor?
  • Do voltage rises occur always and only over source of supply?

Give reasons to support your answers for parts B, C and D.

 

Preference Points

Switch closed Switch open
Potential Difference

volts

Nature

(Rise or Fall)

Potential Difference

volts

Nature

(Rise or Fall)

A-B  
B-C  
C-D  
D-E  
E-F  
F-G  
G-H  
H-J  
J-A        

Total Voltage Rise:

Total Voltage Fall:

Difference (if Any):

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