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Couse No : EEE-1202

Name of the Experiment: Verfication Of KVL and KCL by using Re-active elements .

Objectives: To observe KVL and KCL is equially applicable in terms of AC . By constructing R-L-C series and Parallel Circuit and applying an AC to them . Making sure phasor form of the KVL and KCL also fulfilled in AC through performing this important Experiment .

Introduction:

Kirchoff's Voltage Law Kirchoff voltage law states, that the algebraic sum of voltages across elements, present in a closed loop, is zero at any instant. In the case of ac circuits, the phasor sum of voltages across elements in a closed loop is zero. As in the case of dc circuits, a loop current is assigned for each loop, and the sign for voltages should be marked, in accordance with passive sign convention.

Kirchoff's Current Law

As per Kirchhoff's current law ,the phasor sum of currents flowing into a node or junction in an electrical circuit is equal to the sum of currents flowing out of that node or junctio Required Equipment: 1. Oscilloscope…………………………….…1 Set 2 .Signal Generatior…………………….…1Set 3. Resisor…………………………………..….1 Pcs 4. Capacitor…………………………………..1 Pcs 5. Inductor………………………….…… …..2 Pcs 6. Multimeter………………………….…….2 Pcs 7. Breadboard…………………………..…..1Set 8. Multi plug…………………..……………..1Set

Circuit Diagram :

Fig01: Circuit Diagram of serise Circuit Fig02:

Circuit Diagram of serise-parallel Mixed Circuit Procedures:

1. Construct the circuit as shown in Fig. 1. Set the function generator to supply a voltage of 4V rms at a frequency of 1kHz. Note that the voltage magnitude should be set after the source is connected to the circuit. 2. Measure the voltages VR, VL and VC and the current I with the help of AC meters. 3. Construct the circuit of Fig. 2. The 100 resistance is obtained using the decade resistor box. Again set VS=4V rms, f=1kHz. Now the function generator is connected to the circuit. 4. Measure the voltages VR, VL and VP and the currents I, I1 and I2

Observation table :

Table : 01 Type of Data

I (mA)

Vs(v)

VR(V)

Vl(V)

Vc(V)

Vs(From vector Diagram)

Practical

26.46

4.0

2.63

1.92

4.31

3.937

Calculated

29.72

4.0

2.97

2.05

4.73

N/A

Table :02 Type of Data

Vs(v)

VR(v)

VL

Vp(v)

I(mA)

I1(mA)

I2(mA)

Practical

4.0

2.1

1.47

1.76

24.46

10.73

18.07

Calculate d

4.0

2.33

1.61

1.97

23.30

12.27

19.72

I (From vector Diagram) 21.032 N/A

Report: 1. Theoretically calculate all the voltages and the currents in the circuits shown in Fig.1 and Fig.

2. Comment on the relative magnitudes I, I1 and I2 in the circuit of Fig. 2. 2. Assuming the circuit elements to be ideal, draw the phasor diagrams for both the circuits using the experimental data. The diagrams should be drawn to scale on graph paper.

3. From the phasor diagrams, express the voltages and the currents as phasors and compare those with the values calculated in step 1.

4. Show that the voltage and the current phasors obtained in step 3 satisfies KVL and KC....