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Home > Analog technology > What is a 1k Resistor? 1k Ohm Resistor Color Code

What is a 1k Resistor? 1k Ohm Resistor Color Code

Update Time: 2023-12-21 11:44:51


What is a 1k Resistor?

First of all, Resistors are electronic components that impede the flow of electric current. They are commonly used in circuits to control the amount of current or voltage in a circuit. The resistance value of a resistor determines how much it restricts the flow of electric current. In the case of a 1k resistor, it allows more current to pass through compared to higher resistance values, such as 10k (10 kilohms) or 100k (100 kilohms) resistors.

A 1k resistor refers to a resistor with a resistance value of 1 kilohm. The symbol "k" represents the metric prefix "kilo," which signifies a multiplier of 1,000. Therefore, a 1k resistor has a resistance of 1,000 ohms.

1k Resistor

1k Resistor Color Code


1k Resistor

Let's break down the meaning of each color in the chart:

Brown (1st band): The brown color represents the first digit of the resistance value. In this case, brown corresponds to the number 1.

Black (2nd band): The black color represents the second digit of the resistance value. For the 1k resistor, black corresponds to the number 0.

Red (3rd band): The red color indicates the multiplier for the resistance value. In this case, red corresponds to 10^2, which means the resistance should be multiplied by 100. So, the value of the resistor is 10 * 100 = 1,000 ohms or 1k ohm.

Gold (4th band): The gold color represents the tolerance of the resistor. Tolerance refers to the allowable deviation in the resistance value from the specified 1k ohm. In this case, the gold band indicates a tolerance of 5%, which means the actual resistance can vary by 5% from the stated value. For a 1k resistor with a 5% tolerance, the actual resistance can range from 950 ohms (1,000 - 5%) to 1,050 ohms (1,000 + 5%).

To summarize, a 1k ohm 4 band resistor with the color code of brown-black-red-gold has a resistance value of 1,000 ohms, with a tolerance of 5%. 1k ohm resistor 5 band color is brown-black-black-silver-(Tolerance).

If you want to measure the color code of other resistors besides 1k ohm resistor color code, you can use Resistor Color Code Calculator, which will help you to identify the color code of resistors accurately and quickly. Besides that, you can read this article for details about the color codes of the 4.7k resistors: What is a 4k7 Resistor?4.7k ohm Resistor Color Code.

1k Resistor

Applications of 1k Resistor

Resistors are generally used for voltage dividing or current limiting, but resistors as small as 1 ohm have some special uses.

  • As the emitter load of an amplifier circuit, it can be seen in push-pull circuits to stabilize the operation of transistors.

  • Phase compensation circuits with capacitors or inductors; it is often found in the output stage of audio power amplifier circuits.

  • Used in overcurrent protection circuits; when overcurrent occurs, this resistor burns out first to self-sacrificially protect the more important and expensive circuit behind it.

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  • What is the power rating of a typical 1k resistor?
  • The power rating of a 1k resistor depends on its physical size and construction. Common power ratings for 1k resistors are 0.25W, 0.5W, and 1W.                        

  • Can a 1k resistor be used to limit the current in an LED circuit powered by a 9V battery?
  • Yes, a 1k resistor can be used to limit the current in an LED circuit powered by a 9V battery. By using Ohm's Law, you can calculate the resistor needed to limit the current based on the desired current value.                        

  • How much current will flow through a 1k resistor in a circuit with a 5V power supply?
  • Using Ohm's Law (V = I * R), the current (I) can be calculated by dividing the voltage (V) by the resistance (R). In this case, the current would be 5V / 1000Ω = 0.005A or 5mA.                        

  • What is the difference between 1K and 10K resistors?
  • The 1k resistor regulates the current to protect the LEDs from damage. The 10k resistor control the current entering the capacitors, determining the "time constant" for capacitor charging. This partnership of resistors and capacitors dictates the speed of the LED flashing.

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