This document describes an experiment on Ohm's Law conducted by students at Palestine Polytechnic University. The objectives are to study the relationship between current (I) and potential difference (V) across a resistor and determine resistance using Ohm's Law. Equipment used includes a digital multimeter, ammeter, wires, power supply and circuit board. Calculations show the linear relationship between current, voltage and resistance. The experiment involves three exercises to determine circuit resistance, current and voltage using Ohm's Law. In conclusion, Ohm's Law states voltage is directly proportional to current if temperature remains constant, and the relationships can be verified using ohmmeters, color codes and ammeters/voltmeters.

1. 1
Palestine Polytechnic University
Collage of IT and Computer Engineering
Computer Systems Engineering Department
Electrical Circuits Lab
Experiment Title: Ohm's Low
Experiment Number: 2
Date: 18 February 2013
Instructor:
Zahir Sa'afeen
Experiment # 1: Ohm's Law

2. 2
Objectives:
To study the dependence of current (I) on the potential difference (V)
across a resistor and determine its resistance using Ohm's low. Also plot
a graph between V and I. Additionally to know how to find the resistance
by different ways: color code, DMM, and Ohm's low.
Equipments:
1. DMM(Digital Multimeter).
2. Ammeter.
3. Wires.
4. Power Supply.
5. DC Fundamental circuit board.
6. FACET base unit.
Theory:
Ohm's Law states that the direct current flowing in a conductoris
directly proportional to the potential difference between its ends. It is
usually formulated as V = IR, where V is the potential difference, or
voltage, I is the current, and R is the resistance of the conductor;which
its value can be measured by ohm's low, color codeor DMM.
Current, voltage and resistance have a linear relation. In any circuit I is
directly proportional with voltage and inversely proportional with
resistance.

3. 3
Calculations and Analysis:
VA = 2
I = 1.33
R = V/R = 2 / 1.33 = 1.5
Slope = ∆ V/ ∆ I
= (4 – 2) / (2.67 – 1.33)
= 2 / 1.34
= 1.49
Slope = R
0
2
4
6
8
10
12
0 2 4 6 8
voltage(V)
Current(A)
RealationShip Between
V & I

4. 4
Experimental circuits and exercises:
Exercise 1 : ( Ohm's Law - Circuit Resistance )

5. 5
Exercise 2 : ( Ohm's Law - Circuit Current )

6. 6
Exercise 3:( Ohm's Law - Circuit Voltage )
Conclusions:
Ohm’s law states that voltage is directly proportional to current,
provided that the temperature remains constant.
We can use Ohm's low to determine the resistance (R=V/I) and verify
that by using ohmmeter or color code.
We can use Ohm's low to determine the current value(I=V/R) and
verify that by using Ammeter which is connected in series to the circuit.
Also we can use Ohm's low to determine the voltage value(V=IR) and
verify that by using Voltmeter which is connected in parallel to the
circuit.