Very straightforward lab. Report is not needed. Just complete all procedures and get the spreadsheet done please.NOVA Online PHY232-LAB
Title: Ohm’s Law using PhET Simulation
The fundamental relationship among the three important electrical quantities current, 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 current through a resistor is proportional to the voltage across the
resistor and inversely proportional to the resistance. In this experiment you will see if Ohm’s law
is applicable by generating experimental data using a PhET Simulation:
http://phet.colorado.edu/en/simulation/ohms-law
Current 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 as illustrated in the lecture room. Here is a chart of the three electrical units we
will study in this experiment.
Electrical Quantity
Description
Unit
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
Current
A measure of the flow of
charge in a circuit.
Ampere (A)
Amount of water flowing
Resistance
A measure of how difficult
it is for current to flow in a
circuit.
Ohm ()
A measure of how
difficult it is for water to
flow through a pipe.
Figure 1:
OBJECTIVES:

Determine the mathematical relationship between current, potential difference, and
resistance in a simple circuit.
• Examine the potential vs. current behavior of a resistor and current vs. resistance for a fixed
potential.
MATERIALS
1. PhET Simulation – Ohms Law
2. Excel Spreadsheet
PRELIMINARY SETUP AND QUESTIONS
1. Start up your internet browser. Start up the PhET Simulation at
http://phet.colorado.edu/en/simulation/ohms-law
2. Click on download and the screen above in figure 1 appear. Minimize your browser.
3. Get Excel Spreadsheet ready.
4. With the Resistance slider set at its default value, move the potential slider, observing what
happens to the current.
If the voltage doubles, what happens to the current?
Click here to enter text.
What type of relationship do you believe exists between voltage and current?
Click here to enter text.
5. With the Voltage slider set at 4.5 V, move the resistance slider, observing what happens
to the current.
If the resistance doubles, what happens to the current?
Click here to enter text.
What type of relationship do you believe exists between current and resistance?
What type of relationship do you believe exists between current and resistance?
PROCEDURE A:
1. Set the Resistance slider to 300 ohms, Use the Voltage slider to adjust the Potential to the
values in data table 1, also recording the resulting electric currents.
Data Table 1
Resistance R = Click here to enter. 
Potential (V)
Current (mA)
1.5
3.0
4.5
6.0
7.5
9.0
2. Using Excel Spreadsheet, record the data and plot a graph of Potential (V) vs Current(mA)
and perform a linear fit.
3. Record the slope of the graph below data table 1. Calculate the resistance value by taking
the slope of the graph times 1000. Compare the slope times 1000 value with the value of
the resistance set in the simulation by calculating the % error.
PROCEDURE B:
1. Switch back to the PhET Simulation. Set the Resistance slider to 600 ohms, Use the Voltage slider to
adjust the Potential to the values in data table 2, also recording the resulting electric currents.
Data Table 2:
Resistance R = Click here to enter. 
Potential (V)
1.5
3.0
4.5
6.0
7.5
9.0
Current (mA)
Slope of graph = Click here to enter. V/mA
Slope times x 1000 = Click here to enter. 
% Error of Slope times 1000 with R = Click here to enter. %
2. Enter your data from Table 2 under Data Set 2. Perform a “linear fit” on the data. Record the
slope of the graph below data table 2. Calculate the resistance value by taking the slope of
the graph
timesof1000.
slope
timeshere
1000
% Error
Slope Compare
times 1000the
with
R = Click
to value
enter. with
% the value of the resistance
set in the simulation by calculating a % error.
Does a linear Function work well with both data sets of V vs I data? Click here
PROCEDURE C:
1. Switch back to the PhET simulation. Return the Voltage Slider to 4.5 V. Now we will use the
Resistance slider to set the Resistor to the values in the table. Fill in table 3 with your data:
Data Table 3:
Electric Potential V = Click here to enter Volts
R (ohms)
Current (mA)
100
200
300
400
500
600
700
800
900
1000
Inverse Fit Constant of graph of I vs R = Click here to enter mA
Fit Constant divided by 1000 = Click here to enter Volts
% Error of Fit Constant divided by 1000 with V = Click here to enter %
% Error of Fit Constant divided by 1000 with V = Click here to enter %
2. Enter your Resistance and Current values from Table 3 in Data Set 3.
3. Using Curve Fit, try fitting this data to an “Inverse” function.
4. Calculate the Battery Voltage by taking the Inverse fit constant divided by 1000. Compare this
computed value with the value of the battery voltage set in the simulation by calculating a % error
Does an inverse function provide a good fit to your data?
Click here
ANALYSIS:
Do the experimental data confirm that the Electric Current in a resistor is directly proportional to the
electric potential provided by the batteries?
Click here to enter text.
Do the experimental data confirm that the electric current is inversely proportional to the Resistance for
a fixed electric potential?
CONCLUSION:
Finally, write a short lab report, attach all plotted graphs, and answer all questions in the experiment
as indicated.
Please, note this is individual lab report writing. You may send your report through Canvas.

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