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Questions and Answers
What is the purpose of the last band on a resistor?
What is the purpose of the last band on a resistor?
What is the unit of measurement for the resistance value calculated in the example?
What is the unit of measurement for the resistance value calculated in the example?
How many resistors are measured and recorded in the procedure?
How many resistors are measured and recorded in the procedure?
What is the formula to calculate the maximum resistance value (Rmax) of a resistor?
What is the formula to calculate the maximum resistance value (Rmax) of a resistor?
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What is the purpose of the second method of finding the resistance value of a resistor?
What is the purpose of the second method of finding the resistance value of a resistor?
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What is the value of the resistor in the example, when multiplied by the multiplier band?
What is the value of the resistor in the example, when multiplied by the multiplier band?
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Study Notes
Resistor Color Code Experiment
- The experiment aims to learn and determine the stated value of a resistor by interpreting the color code indicated on the resistor.
Theory of Resistor Color Code
- There are two ways to find the resistance value of a resistor: by interpreting the color bands on the resistor body and by measuring it with an ohmmeter.
5-Band and 4-Band Resistors
- The color bands on 5-band and 4-band resistors indicate the resistance value, with the last band indicating tolerance.
- The tolerance value can be found by consulting the “Resistor Tolerance” chart in Table (2).
Color Code Interpretation
- The first band represents the first significant figure, the second band represents the second significant figure, and the third band represents the multiplier.
- The color code is represented by a word, with each letter corresponding to a color, as shown in Table (1).
Example of Resistor Value Calculation
- If the first band is brown (1), the second band is black (0), and the multiplier band is red (103), the resistance value is 10 * 1000 = 10,000 Ohms.
Measuring Resistance with an Ohmmeter
- Another way to determine the resistance value is to measure it with an ohmmeter, with an explanation provided in a later tip.
Experiment Procedure
- Measure and record the values of twenty 1 kΩ resistors.
- Calculate the maximum (Rmax) and minimum (Rmin) resistance values, and then calculate the percentage error using the formula: Rmax = R + (R * T).
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Description
Learn about resistor color codes and determine the stated value of a resistor by interpreting the color code. Understand the two ways to find the resistance value of a resistor and learn about 5-band and 4-band resistors.
