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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