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Online 4-Band Resistor Color Code Calculator
In electronics, resistors are passive components that limit the flow of electrical current in a circuit. They come in a variety of sizes and resistance values, which are often marked using color codes. These codes are a convenient way to communicate the resistance value of resistors without needing to write it out numerically.
The 4-band resistor color code is a widely used system for identifying resistors’ values, where each color represents a specific number. The online 4-band resistor color code calculator is a tool designed to convert the colors on a resistor into its resistance value, tolerance, and multiplier.
The 4-Band Resistor Color Code System:
The 4-band resistor color code uses four colored bands to represent:
- First Band (Digit 1): The first digit of the resistance value.
- Second Band (Digit 2): The second digit of the resistance value.
- Third Band (Multiplier): A multiplier to scale the two-digit number.
- Fourth Band (Tolerance): The tolerance or accuracy of the resistor.
The colors are mapped to specific numbers as follows:
| Color | Digit | Multiplier | Tolerance (%) |
|---|---|---|---|
| Black | 0 | 10010^0 (1) | ±1% |
| Brown | 1 | 10110^1 (10) | ±2% |
| Red | 2 | 10210^2 (100) | ±5% |
| Orange | 3 | 10310^3 (1,000) | ±10% |
| Yellow | 4 | 10410^4 (10,000) | ±20% |
| Green | 5 | 10510^5 (100,000) | – |
| Blue | 6 | 10610^6 (1,000,000) | – |
| Violet | 7 | 10710^7 (10,000,000) | – |
| Gray | 8 | 10810^8 (100,000,000) | – |
| White | 9 | 10910^9 (1,000,000,000) | – |
| Gold | – | 10−110^{-1} (0.1) | ±5% |
| Silver | – | 10−210^{-2} (0.01) | ±10% |
How the 4-Band Resistor Color Code Works:
For example, consider a resistor with the following color bands:
- Red (Digit 2): 2
- Violet (Digit 7): 7
- Orange (Multiplier 10310^3): 1,000
- Gold (Tolerance ±5%): 5% tolerance
This corresponds to a resistor value of:
(27 \times 1000) = 27,000 \, \Omega \text{ (27 kΩ)} \quad \text{with ±5% tolerance}
So the resistor’s value is 27 kΩ ±5%.
What is an Online 4-Band Resistor Color Code Calculator?
An Online 4-Band Resistor Color Code Calculator is a web-based tool designed to automatically decode the colors on a resistor and calculate the resistance value, multiplier, and tolerance. By simply selecting the colors of the resistor’s bands, users can instantly know the exact resistance and tolerance, without manually calculating it.
This tool is essential for electronics enthusiasts, engineers, and hobbyists who frequently work with resistors but may not always remember the color code chart. It’s also useful for students learning about electronics and resistors.
How Does the Online 4-Band Resistor Color Code Calculator Work?
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Input Selection: The user selects the colors corresponding to the 4 bands on the resistor.
- First, select the color for Band 1 (Digit 1).
- Next, select the color for Band 2 (Digit 2).
- Then, choose the color for Band 3 (Multiplier).
- Finally, select the color for Band 4 (Tolerance).
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Automatic Calculation: Once the colors are selected, the calculator converts these colors into their numerical equivalents based on the color-to-number chart and multiplier values.
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Output: The calculator then displays the resistor’s value (in ohms), the multiplier, and the tolerance. It also provides the final value with the tolerance (e.g., 10kΩ ±5%).
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Optional Features: Some calculators might also provide a graphical representation of the resistor or a breakdown of how the final value was calculated.
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