Module 7 – Ohm's Law – Instructions
Caution:
Before you start this experiment, understand that you are expected to follow directions EXPLICITLY! Take your time and read the directions for each step and for each part of the experiment. You will be required to enter data in a particular format in each table of the Worksheet. You will also be required to enter data in WebAssign in a particular format.
For a printer-friendly version of these instructions, click the Print button in the upper-right corner of this page.
Before you start this experiment, understand that you are expected to follow directions EXPLICITLY! Take your time and read the directions for each step and for each part of the experiment. You will be required to enter data in a particular format in each table of the Worksheet. You will also be required to enter data in WebAssign in a particular format.
For a printer-friendly version of these instructions, click the Print button in the upper-right corner of this page.
LEARNING OUTCOMES (from Syllabus)
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•Solve a variety of basic problems in particle kinematics (uniform motion and accelerated motion, including "free fall"), dynamics using Newton's Laws of Motion and the conservation laws of energy and momentum (e.g., collisions), fluid mechanics (including Archimedes' and Bernoulli's Principles), thermodynamics, wave motion, basic electricity (Coulomb's and Ohm's Laws), and radioactive decay.
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•Interpret the results of simple experiments and demonstrations of physical principles.
Experiment Video
Watch the Experiment Video in your course LMS, following along with the instructions in steps 1–3 below.Worksheet
Please print the worksheet for this experiment. You will need this sheet to record your data.
Procedure
Step 1
a
Set the maximum voltage to U = 10 V and the maximum current to I = 100 mA.
b
Reduce the resistance to R = 100 Ω. Increase the voltage on the voltmeter to 10 V.
c
Record the values of the voltage, U, and current, I, found on the bottom right of the green box, in Table 1 on the worksheet.
d
Increase R to 200 Ω and record the value of the current, I, in Table 1. Continue to increase R in steps of 100 Ω until you reach 1000 Ω.
e
Calculations: Multiply the third column by the first column, putting the result in the last column. The first row shows an example worked out.
Step 2
a
Set the maximum voltage to U = 10 V and the maximum current to I = 100 mA.
b
Reduce the resistance to R = 100 Ω. Decrease the voltage on the voltmeter to 5 V.
c
Record the values of the voltage, U, and current, I, found on the bottom right of the green box, in Table 2.
d
Increase R to 200 Ω and record the current in Table 2. Continue to increase R in steps of 100 Ω until you reach 1000 Ω.
e
Calculations: See Step 1e above.
Step 3
a
Set the maximum voltage to U = 30 V and the maximum current to I = 100 mA.
b
Reduce the resistance to R = 100 Ω. Increase the voltage on the voltmeter to 20 V.
c
Record the values of the voltage, U, and current, I, found on the bottom right of the green box, in Table 3.
d
Increase R to 200 Ω and record the current in Table 3. Continue to increase R in steps of 100 Ω until you reach 1000 Ω.
e
Calculations: See Step 1e above.
Questions
Look over your data and answer the following questions.1
With the voltage set at a constant value, such as 10 V, what happens to the current as the resistance is increased?
2
With the resistance set at a constant value, such as 100 Ω, what happens to the current as the voltage is increased?