电阻计算器
使用我们简单易用的计算器，通过色带计算电阻值，为您的电路找到合适的电阻，并学习如何读取电阻色码。
Resistor Color Code Calculator
Use this calculator to determine resistance value and color code
Brown
Black
Red
Gold
Reference Table
| Color | Digit | Multiplier | Tolerance |
|---|---|---|---|
Black | 0 | ×1 | - |
Brown | 1 | ×10 | ±1% |
Red | 2 | ×100 | ±2% |
Orange | 3 | ×1000 | ±3% |
Yellow | 4 | ×10000 | ±4% |
Green | 5 | ×100000 | ±0.5% |
Blue | 6 | ×1000000 | ±0.25% |
Violet | 7 | ×10000000 | ±0.1% |
Grey | 8 | ×100000000 | ±0.05% |
White | 9 | ×1000000000 | - |
Gold | - | ×0.1 | ±5% |
Silver | - | ×0.01 | ±10% |
None | - | - | ±20% |
Resistor Value
Resistor Information
What is a Resistor?
A resistor is an electronic component that limits the flow of electric current. They are used in circuits to control current and voltage.
The unit of resistance is the Ohm (Ω), named after the German physicist Georg Simon Ohm.
Ohm's Law
$$R = \frac{V}{I}$$
Ohm's Law describes the relationship between voltage, current, and resistance:
V = I × R, where V is voltage (Volts), I is current (Amperes), and R is resistance (Ohms).
About Resistor Color Codes
Resistor color codes are a standardized way to indicate the resistance value, tolerance, and temperature coefficient of resistors. The color bands on a resistor provide this information in a compact form that can be read without specialized equipment.
For 4-band resistors: The first two bands represent the first two digits of the resistance value, the third band is the multiplier, and the fourth band indicates the tolerance.
For 5-band resistors: The first three bands represent the first three digits of the resistance value, the fourth band is the multiplier, and the fifth band indicates the tolerance.
How to Read Resistor Color Codes
Resistor color codes are a standardized way to indicate the resistance value, tolerance, and temperature coefficient of resistors. The color bands on a resistor provide this information in a compact form that can be read without specialized equipment.
How to Read Resistor Color Codes
- For 4-band resistors: The first two bands represent the first two digits of the resistance value, the third band is the multiplier, and the fourth band indicates the tolerance.
- For 5-band resistors: The first three bands represent the first three digits of the resistance value, the fourth band is the multiplier, and the fifth band indicates the tolerance.
- For 6-band resistors: Similar to 5-band resistors, but with an additional sixth band that indicates the temperature coefficient.
Color Band Values
- Digits (1st, 2nd, 3rd bands):
- Multipliers (4th band):
Applications
- Enter the resistor values in the series circuit, separated by commas.
- Click the "Calculate" button to see the total resistance value.
Color Band Values
Resistor color codes are a standardized way to indicate the resistance value, tolerance, and temperature coefficient of resistors. The color bands on a resistor provide this information in a compact form that can be read without specialized equipment.
How to Read Resistor Color Codes
- For 4-band resistors: The first two bands represent the first two digits of the resistance value, the third band is the multiplier, and the fourth band indicates the tolerance.
- For 5-band resistors: The first three bands represent the first three digits of the resistance value, the fourth band is the multiplier, and the fifth band indicates the tolerance.
- For 6-band resistors: Similar to 5-band resistors, but with an additional sixth band that indicates the temperature coefficient.
Color Band Values
Digits (1st, 2nd, 3rd bands):
Multipliers (4th band):
Applications
Resistor color codes are a standardized way to indicate the resistance value, tolerance, and temperature coefficient of resistors. The color bands on a resistor provide this information in a compact form that can be read without specialized equipment.
Applications
- Understanding resistor color codes is essential for electronics hobbyists, students, and professionals working with electronic circuits. This knowledge helps in selecting the right resistor for specific applications and troubleshooting existing circuits.
About Resistor Color Codes
How to Read Resistor Color Codes
For 4-band resistors: The first two bands represent the first two digits of the resistance value, the third band is the multiplier, and the fourth band indicates the tolerance.
Color Band Values
Digits (1st, 2nd, 3rd bands):
Applications
Understanding resistor color codes is essential for electronics hobbyists, students, and professionals working with electronic circuits. This knowledge helps in selecting the right resistor for specific applications and troubleshooting existing circuits.
How do I choose the right resistor?
When selecting a resistor, consider the resistance value, power rating, tolerance requirements, and temperature coefficient. Choose parameters appropriate for the specific needs of your circuit.
Why do some resistors not have color bands?
Some resistors, especially Surface Mount Devices (SMDs) and high-power resistors, use numerical or alphabetical codes instead of color bands to mark their values. These codes follow different marking systems.