Glossary of Wire Wound Resistor
A device that converts electrical energy to thermal energy according to Ohm’s Law.
Resistor whose resistance element consists of a wire (nickel-chromium, copper-nickel, or gold-platinum) wound around a bobbin or core.
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.
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.
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.
The ambient temperature is the temperature in the immediate environment of the resistor.
Maximum power in still air that will limit the resistor internal hot-spot temperature to a satisfactory level.
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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.
Refers to the property of the termination to accept new solder in a soldering process.
Thermal resistance that impedes the dissipation of heat from the resistor.
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)
