1K1

1K1 is a resistor value designation used in electronics to denote 1.1 kilohms (1100 ohms). The "K" acts as a decimal multiplier to indicate the decimal point in the unit of ohms, a convention common in European and international resistor markings.

On through-hole resistors, the resistance is typically represented by a color code; 1.1 kΩ corresponds to the digits 1 and 1 with a multiplier of 10^2, giving brown-brown-red, with a tolerance band such as gold for ±5%. On surface-mount resistors, top markings often print "1K1" to indicate 1.1 kΩ. Tolerances and exact markings can vary by manufacturer, so the datasheet should be consulted for confirmation.

Common applications for 1.1 kΩ resistors include use in voltage dividers, pull-up or pull-down networks, LED current limiting, and various RC and biasing networks. The value offers a balance between current draw and impedance in many analog and digital circuits.

Other related notations form part of a broader resistor labeling system. For example, "1R1" denotes 1.1 ohms, and "4K7" denotes 4.7 kilohms. The choice of letter (K, R) reflects the position of the decimal point in the resistance value. While widely understood, markings can vary by manufacturer or regional standards, so verification with the component’s datasheet is advisable.