A resistance coil is a precision wound resistance element made of high resistance alloy wire (nickel chromium, constantan, manganese copper, or Kama alloy, etc.) uniformly wound on a ceramic, glass fiber, or stainless steel frame, and insulated and encapsulated. It can provide stable and predictable resistance values in AC/DC or pulse circuits, while also possessing high temperature resistance, low inductance, and low noise characteristics. Applied to calibration sources, voltage dividers, and sampling resistors; Variable frequency drive braking unit, motor soft start, load box; Photovoltaic inverter, energy storage system pre charging, charging pile discharge resistance; Aircraft power system, satellite power regulator; High energy physics pulse load, temperature rise testing, aging table.