Ohm's Law states that V=RI where V is the difference of potential at the poles of the element (measured in volts), R is the resistance of the element being tested (a resistor in this case, measured in ohms), and I is the current passing through the circuit (measured in milliamps). When the Y-intercept on the attached voltage drop vs. current in the conductor graph is examined, it is observed that the the ranges of R values overlap, also the expected y-intercept value of 0 falls between the maximum and minimum deviation. By further examining the graph,it is possible to notice that the plot of the voltage drop across the conductor versus the current in the conductor results in a straight line. Furthermore, the origin (0,0) is within experimental error for the y-intercept of the graph. Both these statements show that the tested resistor verified Ohm's Law since theoretically the y-intercept should be 0 and the voltage drop across the conductor versus the current in the conductor should be directy proportional. This can be concluded by observing the equation which is y = .054492x ± 0.0016x -.0254 ± 0.10.

This laboratory had few causes of error that could significantly affect results. The most important factor was a mildly fluctuating power supply (the indicated current did not remain perfectly stable after being adjusted). Another possible cause of error is the possibility of misreading the voltage drop because of the fluctuating power supply. A miscalibrated multimeter could potentially result in inaccurate readings as well since the voltage drop readings were made directly without recalibrating it against a calibrated machine.

...Voltage: Ohm'sLaw and Kirchhoff's Rules
ABSTRACT
Ohm'sLaw and Kirchhoff's rules is fundamental for the understanding of
dc circuit. This experiment proves and show how these rules can be applied to
so simple dc circuits.
INTRODUCTION
In the theory of Ohm'sLaw, voltage is simply proportional to current as
illustrated in the proportionality, V=RI. As shown in this relation, V
represent voltage which is the potential difference across the two ends of a
electrical conductor and between which an electric current, I, will flow. The
constant, R, is called the conductor's resistance. Thus by the Ohm'sLaw, one
can determine the resistance R in a DC circuit without measuring it directly
provided that the remaining variable V and I is known.
A resistor is a piece of electric conductor which obeys Ohm'sLaw and
has been designed to have a specific value for its resistance. As an extension
of the Ohm'sLaw, two more relationship can be drawn for electric circuits
containing resistors connected in series or/and parallel. For resistors
connected in series, the sum of their resistance is, RTOTAL=R1+R2+ ..... +Rn .
And for resistors connected in parallel, 1/RTOTAL==1/R1+1/R2+ ..... +1/Rn .
Complex dc circuit involving a combination of parallel and series resistors can
be analyzed to find the current and...

...JOULE’S LAW
Introduction and research question
In this experiment, we were going to investigate the resistance R of an immersion heater. We had to make our own heater, and measure the resistance using a multimeter. Then we had to measure the current I, using an ammeter and a voltmeter. And at last, we had to determine the power P of the immersion heater. This experiment would require to make a table with the data collection, a graph, and a few calculations using Joule’s and Ohms law.
Our research question is: How can we prove Joule’s law?
Experiment procedure
First build an immersion heater with a cable joints and wires. The heater consists of an approximately 25 cm twisted kanthal wire. Wrap the wire around a pencil for a slinky effect. Tighten the screws to assure that the wires are fastened. To determine the power P of the immersion heater, fill up half of a plastic cup with regular tap water (must be able to cover the wire), and heat it with your immersion heater. By measuring the temperature of water as a function of time, and draw a graph, you can calculate the power P. The heater is lowered into the water and is connected to an AC power supply (alternating current). At the same time using an ammeter and voltmeter, measure the current I through the resistor and the pad. Measure for 5 – 10 min. Make a table and a graph.
Apparatus
Data collection
Our first investigation was to measure the resistance of the immersion...

...Ohms Law
Ohms Law
Thomas More College
Thomas More College
How it applies to different materials
Lucas Cosmidis 11 physics
How it applies to different materials
Lucas Cosmidis 11 physics
Aim/Purpose
The aim is to investigate whether 12v light bulb and a ceramic resistor are either non- ohmic or ohmic. From results calculations can be made to find the resistance produced and then graphed indicating whether the light bulb and ceramic resistor is ohmic or non ohmic
Background Information
An electric circuit is formed when a conductive path is created to allow free electrons to continuously move. This continuous movement of free electrons through the conductors of a circuit is called a current, and it is often referred to in terms of "flow," just like the flow of a liquid through a hollow pipe.
The force motivating electrons to "flow" in a circuit is called voltage. Voltage is a specific measure of potential energy that is always relative between two points. When we speak of a certain amount of voltage being present in a circuit, we are referring to the measurement of how much potential energy exists to move electrons from one particular point in that circuit to another particular point. Without reference to two particular points, the term "voltage" has no meaning.
Free electrons tend to move through conductors with some degree of friction, or opposition to motion. This opposition to motion is more properly...

...CONFIRMING OHM’SLAW
BY ALEX KUCHMENKO
9.1
Aim – To Confirm Ohm’sLaw through experimentation.
Hypothesis – The More Ohms the resistor has, the weaker the current will become.
Materials – Power pack, ammeter, voltmeter, resistors, connecting wires.
METHOD –
1. POWER PACK
POWER PACK
RESISTOR
RESISTOR
VOLTMETER
VOLTMETER
AMMETER
AMMETER
A
A
V
V
Set up a known resistor in a simple circuit.
2. Vary the voltage and record the potential drop (V) and the current (I) through the resistor. Do this for a number of settings on the power pack, for example do two, four and six volt settings. (Remember the power pack should only be turned on while doing readings.)
2. Vary the voltage and record the potential drop (V) and the current (I) through the resistor. Do this for a number of settings on the power pack, for example do two, four and six volt settings. (Remember the power pack should only be turned on while doing readings.)
Another experiment to perform is to attach several resistors to the circuit, for example a 2.2Ω and a 10Ω would make a 12.2Ω resistor.
4. Construct a line graph of the data in the previous table. Put all three sets of data on the same table.
DISCUSSION –
The calculated unknown resistances and line graph confirmed...

...Measurement of Resistance and Ohm’sLaw
Section : 04
Instructor’s Name : BERNA DÜNDAR
Experiment Date : 26/02/2014
Submission Date : 05/03/2014
Measurement of Resistance and Ohm’sLaw
Department of Physics,Işık University
Meşrutiyet Köyü,Üniversite Sokağı,No:2 34980 Şile,İstanbul
Abstract
In this experiment we used two multimeters, a set of resistors, a bundle of connecting wires and a DC power supply. By this experiment we learned how to use the electrical instruments, simple circuit elements and we studied Ohm’slaw.
Theory
In electrical circuits, we are concerned with the flow of electrical current around closed loops made up of wires, meters and other components. For this unit we measured and calculated electrical quantities such as direct current, voltage and resistance.
Current
Electrical current is the rate at which electrical charge flows around a circuit. It is measured in units of amperes (A) by ammeters.
Potential Difference (voltage)
Electrical charge tends to move from points of high potential to points of low potential. The difference in potential between two points is called the potential difference or voltage and is measured in units of volts (V).
Resistance
For many devices, it is found that the potential difference appearing across a device is proportional to the current flowing...

...OHM’SLAW
AIM OF THE EXPERIMENT
Confirmation of OHM’SLAW
THEORY:
It was George Simon Ohm (1787-1854) who established experimentally that the current in a metal wire is directly proportional to the potential difference V applied to its two ends, provided that the physical conditions such as temperature remain constant:
I∞V
Exactly how much current flows in a wire depends not only on the voltage, but also on the resistance the wire offers to the flow of electrons. Electrons are showed down because of interactions with the atoms of the wire. The higher the resistance, the less the current for a given voltage V. Resistance is defined as;
Where R is the resistance of a wire or any other device, V is the potential difference across the device and I is the current that flows through it. This result is known as Ohm’slaw. In this experiment by using equipment circuit experiment board and resistor, we will experimentally verify the Ohm’sLaw.
PROCEDURE:
* I was given a resistor. First of all, I determined the resistance of each resistor from the color codes by using method defined in and wrote my results into the Table.
* I constructed the circuit by using circuit experimental board, DC power supply the resistors.
* I adjusted the voltage of DC power supply to a suitable value and kept it constant. Also measured the current and...

...OHM’SLAW
INTRODUCTION
Ohm'slaw states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them provided the temperature remains constant.
The mathematical equation that describes this relationship is:
where V is the potential difference measured across the resistance in units of volts; I is the current through the resistance in units of amperes and R is the resistance of the conductor in units of ohms. More specifically, Ohm'slaw states that the R in this relation is constant, independent of the current.
The law was named after the German physicist Georg Ohm, who, in a treatise published in 1827, described measurements of applied voltage and current through simple electrical circuits containing various lengths of wire. He presented a slightly more complex equation than the one above (see History section below) to explain his experimental results. The above equation is the modern form of Ohm'slaw.
In physics, the term Ohm'slaw is also used to refer to various generalizations of the law originally formulated by Ohm. The simplest example of this is:
where J is the current density at a given location in a resistive material, E is the electric field at that...

...
Ohm’sLaw
Lab Report Number Three
Quyama T. Wheeler
@02669651
Partner: Munah Kaye
Amber Frazier
Objective: To demonstrate Ohm’slaw and to determine the resistance of a given resistor.
Theory: Ohm’slaw is the assertion that the current through a device is always directly proportional to the potential difference applied to the device. Electric current is the moving of charges from a higher potential to a lower potential. Wires of different material (a copper wire versus a silver wire, for example) will produce different currents, even if applied the same potential difference. This phenomenon, this characteristic respectful to each type of material is known as resistance.
Apparatus:
-two multi-meters (set on the 20mA and 20 V scale)
-unknown resistor board
-Extech instruments (0-18 Volts) Power Supply
Procedure: A circuit connecting the resistor board, the voltmeter and the milli-ammeter is assembled. The 20 milli-ampere range is selected on the ammeter and the 20V on the voltmeter. The power cord is then plugged into an electrical outlet and the unit is turned on. The experiment begins at 15 volts. The voltage and current are both recorded and these steps are repeated successively in two volt increments. A graph of I as a function of V is plotted and fit with a straight line, the slope of which equals the resistance of the...