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the instructions are in the pdf and the work is to complete the lab and answer questions.

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The fundamental relationship among the three important electrical quantities cu
ent, voltage, and resistance was discovered by Georg Simon Ohm. The relationship and the unit of electrical resistance were both named for him to commemorate this contribution to physics. One statement of Ohm’s law is that the cu
ent through a resistor is proportional to the voltage across the resistor. In this experiment you will see if Ohm’s law is applicable to several different circuits using an ammeter and a voltmeter.
ent and voltage can be difficult to understand, because they cannot be observed directly. To clarify these terms, some people make the comparison between electrical circuits and water flowing in pipes. Here is a chart of the three electrical units we will study in this experiment.
    Electrical Quantity
    Water Analogy
    Voltage or Potential Difference
    A measure of the Energy difference per unit charge between two points in a circuit.
    Volt (V)
    Water Pressure, or height difference
    A measure of the flow of charge in a circuit.    
    Ampere (A)
    Amount of water flowing
    A measure of how difficult it is for cu
ent to flow in a circuit.
    Ohm (Ω)
    A measure of how difficult it is for water to flow through a pipe.
Figure 1

· Determine the mathematical relationship between cu
ent, potential difference, and resistance in a simple circuit.
· Compare the potential vs. cu
ent behavior of a resistor with that of resistors in series and parallel.
Online website: https:
PRELIMINARY SEtup and QUESTIONS (to be done in small groups)
1.    Go to the following website and click run:
2.    Try building a few circuits and playing with the controls.
3.    Try to create a circuit that lights the lightbulb.
    a) Draw your circuit here (don't wo
y about making a proper circuit diagram, just sketch what you see on the screen). You can upload a scan of a sketch if you like.
    b) What are the important characteristics of this circuit that make it work? List as many as you can.
4. Now that you can make a light bulb light up, design a simple circuit to test the conductivity of the various objects included in the simulation. Test the following objects by placing them in the circuit (in series with the light bulb) and see if the light bulb lights up or not. Classify them as insulator or conductor based on whether or not a cu
ent can pass through them.
    Wire, Dollar bill, paper clip, coin, eraser, Hand, Dog and pencil.
Any surprises?
5.    Make sure you know how to
    a) Insert and remove circuit elements (wires, resistors, batteries, etc…)
    b) Attach a voltmeter to your circuit to measure the potential difference between two points in your circuit.
    c) Insert an ammeter into the circuit to measure the cu
ent through the circuit.
    d) adjust the resistance of a resistor and the voltage of the battery.
For this experiment, you will follow a simple procedure for determine the resistance using the slope of the V vs. I plot. You will do this for four (4) cases and compare what you get to the theoretical formula for adding resistors in series and parallel.
The cases are
(1) a 10 Ω resistor,
(2) a 50 Ω resisto
(3) the two resistors above in series.
(4) the two resistors above in parallel.
First, set up the circuit as shown in Fig. 1 and follow this procedure:
1.    Record the value of the resistor in the data table 2.
2.    Starting at 0V, increase the voltage in steps up to the maximum allowed, recording the voltage across the resistor, and the cu
ent through the circuit, for each voltage.
3.    Make sure to collect at least 8 points for each setting. Create a data table 1 of V and I and include this table in your lab report.
4.    Plot the voltage vs. cu
ent and fit to a linear function. Include the plot with the fit in your lab report. Fill in the data table 2 with linear fit values.
Data Table XXXXXXXXXXyou will have 5 of these by end of experiments, you can label them 1.1 to 1.5)
Similar tables can be created for all 5 cases measured in this lab.
Now, change the resistor value to 50 Ω and repeat steps 1-4. Make sure to create a new data table for this resistance with the V and I values.
For the next two experiments, you will replace the single resistor with a network of two resistors, one of 10 Ω and one of 50 Ω. You will do this with the two resistors in series, and then repeat with the two resistors in parallel. This will result in two more data sets --- create tables and plots with fits as before for each of these. Include fit results in the data table below.
    Resistance (Ω)
    Slope of regression line (V/A)
    Percent difference
    Resistor 1
    Resistor 2
    Resistors in series
    (value calculated from analysis question 2)
    Resistors in parallel
    (value calculated from analysis question 2)

1.    Calculate the theoretical resistance for the two resistors in series and in parallel using the value you measured from the slope of the graphs of data sets 1 and 2. Put these values in the table column 2.
2. Determine the percent difference between the measured slope from data for the series and parallel circuits (column 3 in data table) to the value for the resistances you calculated in question 2 (in column 2 in data table).
Answered 1 days After Apr 01, 2024


Baljit answered on Apr 03 2024
5 Votes
• Determine the mathematical relationship between cu
ent, potential difference, and resistance in a simple circuit.
• Compare the potential vs. cu
ent behavior of a resistor with that of resistors in series and parallel.
Virtual Lab :- https:
· Ohm Law: Ohm law is discovered by Georg Simon Ohm, which states that the cu
ent flowing through a conductor is directly proportional to the voltage across it, given constant temperature. This relationship, expressed as
· Resistors in Series: When resistors are connected in series, they are a
anged one after another in a single path for cu
ent flow. The total resistance is the sum of the individual resistances ​ in the circuit:
In this case The cu
ent passing through each resistor is the same, as there is only one path for cu
ent flow. The voltage...

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