Ateneo De Zambaoanga University
CITS Department
Name : Hao, Philwin M.
Group # 3
Experiment #2
Parallel Circuit
Objective: To verify Parallel Circuit characteristic using LTspice XVII simulation software
Apparatus: Desktop or Laptop and LTspiceXVII simulation software
Circuit Diagram:
Procedures :
1.
2.
3.
4.
5.
Choose VT : 10 volts < VT < 40 volts
Choose R1, R2 and R3 : 1K < R < 50K
Connect all the resistors and DC source using LTspice VII
Measure the current and voltage drop in every resistor
Verify the characteristic of a Parallel circuit
Data:
VT
20V
V1
V2
Theory
Practical
20V
20V
IT
Theory
20V
Practical
Theory
4.000002mA
PT
P1
Theory
146.6666mW
80mW
Practical
20V
20V
Theory
Practical
20V
20V
I3
I1 + I2 + I3
Practical
Theory
Practical
Theory
Practical
2.000001mA
1.33mA
1.3333mA
7.2mA
7.3333mA
2mA
7.3333mA
Voltage:
20V
Theory
V1= V2= V3
I2
4mA
(VT)(IT)
Practical
I1
Theory
V3
P2
P3
Practical
Theory
Practical
80mW
40mW
40mW
P1+P2+P3
Theory
Practical
Theory
Practical
26.66mW
26.6666mW
146.66mW
146.6666mW
Current:
Power:
Finding the voltages:
We have V=35V
VT= V1= V2= V3
VT= 20V
V1= 20V
V2= 20V
V3=20V
Finding the currents:
Using ohm’s law
V=IR
For I1
V=IR
20=I(5k)
I1= 4mA
For I2
I2= 2mA
For I3
I3=1.33mA
IT= 4+2+1.33
=7.33mA
Finding the power:
We use the formula for power:
For P1
P=VI
P= 20(4)
P1= 80mW
For P2
P=VI
P= 20(2)
P2= 40mW
For P3
P=VI
P= 20(1.33)
P3= 26.66mW
PT= 80+40+26.66
=146.66mW
Observation:
I observe that there is a slight difference between the value of our theoretical values with the
practical which shows that we round of the value of our result to a certain decimal places
compared to ltspice its shows the whole decimal value of the result.
Conclusion:
I conclude that the practical and theoretical value in our exercise have the same
value and the only difference is the decimal place between the two which shows
that it gives the same value between the two field.