A cement resistor marked 5W1KJ is a 5-watt power component with a resistance value of 1 kilohm (1,000 ohms) and a tight tolerance of ±5%. The "5W" denotes the power rating, "1K" stands for 1,000 ohms, and "J" represents the 5% accuracy.

Electrical Specifications

• Resistance: 1 kΩ (1000 Ohms)
• Tolerance: ±5%
• Power Rating: 5W
• Type: Wirewound or cement, axial through-hole mount depending on manufacturer
• Temperature Coefficient: Approximately ±300 ppm/°C for some models 
• Operating Temperature Range: Typically -55°C to 155°C depending on manufacturer