# PHY 1122 Lecture Notes - Lecture 22: Ohmmeter, Multimeter

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2 Mar 2015
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Laboratory report : Simple circuits
1
Simple circuits
Identification page
graphs at the end. If you forgot to print it before your lab, you can reproduce it by hand but you have to follow the exact
format (same number of pages, same items on each page, same space to answer question).
Complete all the identification fields below or 10% of the lab value will be deduced from your final mark for this lab.
For in-lab reports, hand in your report to your demonstrator at the end of the sessions or you will receive a zero for this lab.
For take-home reports, drop your report in the right box or 10% of the lab value will be deduced from your mark. Refer to the
General information document for the details of the late report policy.
Experiment title:
Simple circuits
Name:
Student number:
Lab group number:
Course code:
PHY
Demonstrator:
Date of the lab session:
Partner’s name:
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Laboratory report : Simple circuits
2
Data sheet
Instructions: Use a pen to complete this section before the end of the lab session. Ask your TA to initialize your
data before you leave the laboratory.
Part 1 Measuring a resistance value
[3] Complete the following table:
Table 1 - Resistance values
Color code
Coded
resistance
value
()
Coded
tolerance
(%)
Measured
resistance
value
(k)
Multimeter
range
(k)
Measured
absolute
error
(k)
Are both
values within
tolerance?
(yes or no)
𝑅1
yellow-violet-
brown-gold
470
5
4.000
𝑅2
brown-black-
red-gold
𝑅3
orange-orange-
red-gold
Part 2 Ohm’s law
[3] Complete the following table (no need for uncertainties):
Table 2 Voltage vs. current to verify Ohm’s law
Suggested power
supply voltage
(V)
Measured voltage
at the resistor
(V)
Current going
through the resistor
(mA)
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
[4] Prepare Graph 1. Print it to a pdf file. Send the file to yourself by email or save it on a USB key. Print the graph and
attach it at the end of your report.
[1] What are the values of 𝑚 (slope) and 𝑏 (Y-intercept) in Graph 1? Provide the units.
𝑚 = ( ____________________ ± ____________________ )
𝑏 = ( ____________________ ± ____________________ )
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Laboratory report : Simple circuits
3
Part 3 Combination of resistors
[3] Using the ohmmeter, fill the following table:
Table 3 - Effective resistance for resistors in series
Resistors in series
Measured resistance value
(k)
𝑅1− 𝑅2
𝑅1− 𝑅3
𝑅2− 𝑅3
𝑅1− 𝑅2− 𝑅3
[3] Using the ohmmeter, fill the following table:
Table 4 - Effective resistance for resistors in parallel
Resistors in parallel
Measured resistance value
(k)
𝑅1//𝑅2
𝑅1//𝑅3
𝑅2//𝑅3
𝑅1//𝑅2// 𝑅3
[1] Using the ohmmeter, what is the effective resistance value of the mixed circuit 𝑅1− (𝑅2// 𝑅3).
𝑅effective = ( ____________________ ± ____________________ )
Part 4 Voltages and currents in circuits (Kirchhoff’s rules)
[3] Measure the voltage drops and the currents at each resistor in the mixed circuit. Provide the units.
∆𝑉
0= ( ____________________ ± ____________________ )
𝐼1= ( ____________________ ± ____________________ )
∆𝑉
1= ( ____________________ ± ____________________ )
𝐼2= ( ____________________ ± ____________________ )
∆𝑉
2//3 = ( __________________ ± __________________ )
𝐼3= ( ____________________ ± ____________________ )
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