LABORATORY WORK # 2
APPLICATIONS OF RESISTORS, OHM’S LAW, KIRCHHOFF’S LAWS
Aims: investigate properties of resistors; get skills of the scheme mounting. Compare
experimental results with theoretical foundations about resistors, Ohm’s and Kirchhoff’s laws.
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PREPARATION TO LAB WORK
Learn the information about resistors, Ohm’s law and Kirchhoff’s laws.
Show resistors i-v-characteristic.
Consider experiments’ schemes and draw them with application of Scheme Design
System. Fill in the tables theoretically.
Answer the questions below in written form.
a. What is a resistor?
b. Explain resistor color codes.
c. Define Ohm’s law.
d. Explain parallel and serial connection of resistors.
e. Write formulas for star-to-delta and delta-to-star transformations.
f. Explain Kirchhoff’s current and voltage laws.
g. Explain current and voltage division rules.
h. Explain how to measure the value of resistance with multimeter.
i. Explain how to measure voltage with multimeter.
Experiment 2A. Plug the Y-0016/002 module. Make the circuit connections as in figure3.3
Figure 3.3 (ohm kanunun incelenmesi: examination of ohm’s law, deney: experiment)
Adjust the power supply’s voltage potentiometers to minimum (to left), and the current
potentiometers to maximum (to right). Apply the power to the circuit.
1- Adjust the voltage to the values in figure 3.4 and write the current values at every stage
respectively. Calculate Resistances
Number
V(volt)
I(mA)
R=V/I
1
1,0
9.62
103.95
2
2,0
20.8
96.1
3
3,0
30.95
96.9
4
4,0
40.62
98.5
5
5,0
50.69
98.6
6
6,0
61.1
98.2
Figure 3.4
2- Cut the power of circuit and open the J1 short circuit. This time short circuit J2. Calculate
the mathematical value of R2 resistance. (figure 3.5)
Number
V(volt)
I(mA)
R=V/I
1
1,0
4.92
203.3
2
2,0
9.94
201.2
3
3,0
14.95
200.7
4
4,0
19.74
202.6
5
5,0
24.75
202.02
6
6,0
29.69
202.09
Figure 3.5
Experiment 2B. Plug the Y-0016/002 module make the circuit connections as in figure 4.2
Figure 4.2
Adjust the power supply’s voltage potentiometers to minimum (to left), and the current
potentiometers to maximum (to right). Apply the power to the circuit.
1- Adjust the voltage to the values in figure 4.3 and write the voltage values at every stage
respectively.
Number V(volt)
V1(volt) V2(volt) V3(volt) Sum (V1+V2+V3)
1
2
3,0
6.0
0.993
2.001
0.495
1.486
2.974
0.998
2.994
5.993
Figure 4.3
2- Does the Kirchhoff’ voltage law equation is maintained at every stage? Calculate.
(At every stage, circuit voltage is equal to the sum voltages per resistor.)
Experiment 2C. Plug the Y-0016/002 module make the circuit connections as in figure 4.5
Adjust the power supply’s voltage potentiometers to minimum (to left), and the current
potentiometers to maximum (to right). Apply the power to the circuit.
1- Adjust the voltage to the values in figure 4.6 and write the current values at every stage
respectively.
Number
1
2
3
V(volt)
2,0
4.0
6,0
I(mA)
29.75
58.04
87.3
I1(mA)
19.44
38.97
58.53
Figure 4.6
I2(mA)
9.97
19.73
29.64
I1+I2(mA)
29.41
58.7
88.17
2- Is the total current flowing into node (I) equal to the total current flowing out of the node
(I1-I2)? Calculate for every step.
Figure 4.5
7- Calculate the power coefficient and the phase angle.
8- Find the power coefficient and phase angle of the circuit.