A 22 ohm resistor is a passive component that provides 22 ohms (Ω) of electrical resistance to limit current or condition signals in a circuit.

Color Codes

4-Band Resistor (Standard 5% tolerance): Red, Red, Black, Gold
• First band (Red): 2
• Second band (Red): 2
• Third band (Black multiplier): × 1
• Fourth band (Gold tolerance): ± 5%
5-Band Resistor (1% tolerance): Red, Red, Black, Gold, Brown 
Common Applications
Current Limiting: Protecting LEDs or sensitive inputs from excessive current.
USB Data Lines: Acting as series termination resistors on D+ and D- lines in USB microcontroller circuits.
Signal Matching: Helping match impedances in basic radio frequency or audio setups.