Department OF Computer Science and Engineering
Name of the Experiment:
Introduction to Circuit Elements and Variables
Exp No: 1
Course: CSE209 Electrical Circuit
Student Name: Md. Abir Hossain
Student ID: x-x-x-x
Group No: 6
Group ID’s:
x-x-x-x Abir Hossain Sadat
x-x-x-x Nafis Fuad Mihal
x-x-x-x Rumiya Khan
x-x-x-x Farjana Najrin
Date of Performance: 1 / 7 / 2025
Date of Report Submission: 15 / 7 / 2025
Submitted to Ms. Musharrat Khan Senior Lecturer, CSE EWU
Circuit Diagram:
Datasheet:
Set Value of Measured Measured mean
Measured
Observation No. Voltage Value of Value of
Value of V(v)
E (v) I(mA) R(Ω)
1 5 4.960 5
2 6 5.963 6
3 7 6.968 7
991
4 8 8.028 8
5 9 8.993 9
6 10 9.982 10
Post-Lab Report Question:
Que No1:
Theoretically calculate the values of I using measured values of V and R.
Compare the theoretical values with the measured values and comment on
any discrepancy.
To calculate the current (I) using Ohm's Law,
I = V/R
Given:
● V ranges from 5 to 10 volts
● R=1000 Ω
Current (I = V/R) in
Voltage(V) Resistance (Ω)
Amperes
5 1000 0.005 A (5 mA)
6 1000 0.006 A (6 mA)
7 1000 0.007 A (7 mA)
8 1000 0.008 A (8 mA)
9 1000 0.009 A (9 mA)
10 1000 0.010 A (10 mA)
There is no difference between theoretical value and measured value of I.
Que No2:
Theoretically calculate the values of R from the measured values of V and I
using Ohm's law. Compare the calculated and measured values of R and
comment on any discrepancy.
Obs. Measured Measured I I (A) R = V / I (Ω)
V (V) (mA)
1 4.960 5 0.005 4.960/0.005=992 Ω
2 5.963 6 0.006 5.963/0.006=993.83 Ω
3 6.968 7 0.007 6.968/0.007=995.43 Ω
4 8.028 8 0.008 8.028/0.008=1003.5 Ω
5 8.993 9 0.009 8.993/0.009=999.22 Ω
6 9.982 10 0.010 9.982/0.010=998.2 Ω
There is a difference in the theoretical value of R and Measured value of R
Theoretical mean value of R = 997.03 Ω
Measured mean value of R = 991 Ω
Que No3:
Compare the set value of E and the measured value of V and comment on
any discrepancy.
Set Voltage E Measured Voltage V Difference E−V
(V) (V)
5 4.960 0.040
6 5.963 0.037
7 6.968 0.032
8 8.028 -0.028
9 8.993 0.007
10 9.982 0.018
The measured values are very close to the set values. There are small
differences (within ±0.04 V) which are typical and acceptable in practical
lab settings.
Que No4:
Plot V vs. I (taking I as an independent variable) and fit a straight-line
passing through the origin. From the plot determine the resistance of the
supplied resistor using Ohm's law. Compare this value with the measured
value and comment on any discrepancy.
From the slope of this line, the resistance is calculated as:
R = 998.13 Ω
There is a difference between the values but this much is acceptable.
Que No5:
Discuss how voltage or current is measured using a multi-range meter.
Voltage is measured by connecting the wires of multi-meter across the
resistor and current is measured by connecting the wires of multi-meter
before the resistor. To find the voltages and currents the knob of the
multi-meter is controlled properly.
Conclusion:
The experiment was conducted to verify Ohm’s Law and determine the
resistance of a given resistor. The measured voltage and current values
showed a linear relationship, confirming the validity of Ohm’s Law. The
calculated resistance from individual readings was consistent, with a mean
value close to 1000 ohms. The graphical analysis further supported this
result, with the voltage-current plot yielding a straight line through the
origin. Overall, the experiment demonstrated that the resistor behaves in
accordance with Ohm’s Law, and the measurements were within
acceptable accuracy limits.
