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In-Lab Worksheet, Intro to Electricity PS253-Physics Lab for Engineers
Name: Abdullah Alhaj Ali
- Page 1 of 7 -
DMM Practice
Table 1: DMM Practice. Resistor color codes and their resistances as measured by an Ohmmeter
Resistor
R1
R2
R3
R4
Color Code
BR BL R G
GR BR BR G
O BL BR G
BR GR R G
Resistance []
986
502
296
1491
Battery Voltage: 9.54V
Resistor selected to test: R1
Resistor Current:9.6 mA
Resistor Voltage: 9.47V
1. Solve Ohms law to find the current another way, using V
r
and R, where

. Compare I
calc
and I
r
by a percent difference:


. This should be less than 10%. Show your work.



 


 

 

 

 
Resistors in Series and Parallel Circuits
Draw your Circuit Diagram
Table 2: DMM measurements of resistors in a
simple circuit
Component
Resistance
[Ω]
Current
[mA]
Power
Supply
---
---
R1
986
6.6
R2
502
5.4
R3
296
1.5
R4
1491
1.5

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In-Lab Worksheet, Intro to Electricity PS253-Physics Lab for Engineers
- Page 2 of 7 -
2. Compute the effective resistance of R3 and R4 in parallel with R2.

  








 

3. Add R1 to the result from above to find the total resistance. Solve



. If this
result differs by more than 10% from the current measured through R1 then you must recheck
all your measurements and confirm. Show your work.

  







 
 

 
4. Solve for V
R1
= I
total
R1. If this result differs by more than 5% from the measured voltage across
R1, then recheck all your measurements. Show your work.

 

 



 
 

 

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In-Lab Worksheet, Intro to Electricity PS253-Physics Lab for Engineers Name: Abdullah Alhaj Ali DMM Practice Table 1: DMM Practice. Resistor color codes and their resistances as measured by an Ohmmeter Resistor R1 R2 R3 R4 Color Code BR BL R G GR BR BR G O BL BR G BR GR R G Resistance [] 986 502 296 1491 Battery Voltage: 9.54V Resistor selected to test: R1 Resistor Current:9.6 mA Resistor Voltage: 9.47V 1. Solve Ohms law to find the current another way, using Vr and R, where 𝐼𝑐𝑎𝑙𝑐 = |𝐼𝑐𝑎𝑙𝑐 −𝐼𝑟 | and Ir by a percent difference: ( 𝐼𝑟 𝐼𝑐𝑎𝑙𝑐 = %𝑑𝑖𝑓𝑓𝑒𝑟𝑒𝑛𝑐𝑒 = Resistors in 𝑉𝑟 𝑅 . Compare Icalc ) ∙ 100%. This should be less than 10%. Show your work. 𝑉𝑟 9.47V = = 9.60 × 10−3 𝐴 𝑅 986Ω |9.60 × 10−3 𝐴 − 9.60 × 10−3 𝐴| 9.60 × 10−3 𝐴 Series and × 100% = 0% Parallel Circuits Draw your Circuit Diagram Table 2: DMM measurements of resistors in a simple circuit Component Resistance Current Voltage [Ω] [mA] [V] Power ----9.54 Supply R1 986 6.6 6.77 R2 502 5.4 2.69 R3 296 1.5 0.44 R4 1491 1.5 2.24 - Page 1 of 7 - In-Lab Worksheet, Intro to Electricity PS253-Physics Lab for Engineers 2. Compute the effective resistance of R3 and R4 in parallel with R2. 𝑅𝑒𝑞1 = 296Ω + 1491Ω = 1787Ω 1 𝑅𝑒𝑞2 = 1 𝑅𝑒𝑞1 + (1787Ω)(502Ω) 𝑅𝑒𝑞1 𝑅2 1 ⇒ 𝑅𝑒𝑞2 = = = 391.91Ω 𝑅2 ...
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I was having a hard time with this subject, and this was a great help.

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