Electrical Resistance in Various Circuit Configurations
Name: ______Period: _____ Date: 12/2/15
Part 1: Measuring and Determining Resistance
Pre-lab (complete during warm-up time on 12/2)
Definition of Resistance:
Units = ______name ______symbol
Summarize and Illustrate the Resistor Color code(colored pencils are to be shared at your station)
0 =
1 =
2 =
3 =
4 =
5 =
6 =
7 =
8 =
9 =What does the gold stripe represent?
Lab Purpose: To determine the resistance of several ceramic resistors while practicing the use of a digital multimeter; to verify the acceptability of the given resistors by determining how close the experimental resistances are to the theoretical resistances
Data Collection:
Table 1: Theoretical Resistances Based on the Color Coding on the Resistors
Color Code / Theoretical Resistance / ±5% / Theoretical Resistance—Maximum value / / Theoretical Resistance—Minimum value / 1.
2.
Table 2: Resistances as measured with a digital multimeter
Color Code / Measured Resistance / / Resistance Uncertainty / 1.
2.
Part 1 Lab Analysis(Attach a separate sheet of paper if you need more space for your responses):
- Based on the data collected, discuss the accuracy of the resistors’ manufactured color codes.
- Based on the data you collected, discuss the precision of your measured values.
Part 2: Resistors in Series and in Parallel
Pre-Lab: When you complete part 1 and its analysis, select 3 of the resistors that are between 100 and 680. Please make sure you have 3 different resistances.
Look up the following:
Definition of Effective Resistance (Reff):
How can you calculate the effective resistance for the following circuit constructions (explain both with words and by writing an equation):
-Parallel:
-Series:
Part 2 Data Collection
Series set-up:
Illustrate the set-up for your set of resistors connected in series. Include the correct color coding and label with the expected resistance for each individual resistor.
Table 3: Resistances in a series configuration, arrangement #1
Resistor #1 Measured Resistance / / Resistor #2 Measured Resistance / / Resistor #3 Measured Resistance / / Measured Effective Resistance / Does the measured effective resistance depend on the order in which the resistors are arranged?
(yes or no)?
Support your answer with evidence:
Table 4: Resistances in a series configuration, arrangement #2
Resistor #1 Measured Resistance / / Resistor #2 Measured Resistance / / Resistor #3 Measured Resistance / / Measured Effective Resistance / Table 5: Expected compared to Measured effective resistances in series
Series #1 Measured Effective Resistance / / Series #1 Expected Effective Resistance / / Series #2 Measured Effective Resistance / / Series #2 Expected Effective Resistance / Show work for one of the calculated expected effective resistances:
Quantitatively compare your results for each series:
Part 2 Data Collection
Parallel set-up:
Illustrate the set-up for your set of resistors connected in parallel. Include the correct color coding and label with the expected resistance for each individual resistor.
Table 6: Resistances in a Parallel configuration, arrangement #1
Resistor #1 Measured Resistance / / Resistor #2 Measured Resistance / / Resistor #3 Measured Resistance / / Measured Effective Resistance / Does the measured effective resistance depend on the order in which the resistors are arranged?
(yes or no)?
Support your answer with evidence:
Table 7: Resistances in a Parallel configuration, arrangement #2
Resistor #1 Measured Resistance / / Resistor #2 Measured Resistance / / Resistor #3 Measured Resistance / / Measured Effective Resistance / Table 8: Expected compared to Measured effective resistances in Parallel
Parallel #1 Measured Effective Resistance / / Parallel #1 Expected Effective Resistance / / Parallel #2 Measured Effective Resistance / / Parallel #2 Expected Effective Resistance / Show work for one of the calculated expected effective resistances:
Quantitatively compare your results for each parallel set: