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Glossary of Wire Wound Resistor

  • Resistor
A device that converts electrical energy to thermal energy according to Ohm’s Law.
  • Wire wound
Resistor whose resistance element consists of a wire (nickel-chromium, copper-nickel, or gold-platinum) wound around a bobbin or core.
  • Fusing Resistor
A resistor intended to interrupt a current flow at a predetermined time when the current passing through it exceeds a predetermined value. It is nonrenewable, in other words, it is intended to be replaced following operation.
  • Operating Voltage
The limiting element voltage Vmax is the Maximum voltage that may be applied continuously to the resistor provided its resistance value is equal to or higher than the critical resistance. The limit applies to DC voltages and to AC rms voltage of undistorted sinusoidal shape.
  • Maximum Working Voltage
The maximum voltage stress (DC or rms) that may be applied to the resistor (resistance element). A function of the materials used, the required performance, and the physical dimensions.
  • Ambient Temperature
The ambient temperature is the temperature in the immediate environment of the resistor.
  • Power Rating
Maximum power in still air that will limit the resistor internal hot-spot temperature to a satisfactory level.
  • Resistance Temperature Characteristic
It refers to the magnitude of change in resistance due to temperature, expressed in percent or degree centigrade or parts-per-million per degree centigrade(PPM/C). If the resistance changes are linear over the specified temperature range, the parameter is known as the temperature ”coefficient”. This assumption of linearity is usually made in order to ease calculations.
  • Solderability
Refers to the property of the termination to accept new solder in a soldering process.
  • Temperature Rise
Thermal resistance that impedes the dissipation of heat from the resistor.
  • Color Code
Color bands that painted onto the body of a resistor, with an aim to indicate the resistance value and tolerance of the resistor. (Ref. to the following Figure)