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Home > Passive Components > Wirewound Resistors > 56R187 Wirewound Resistor 0.018 Ohms 3W 5% Axial

56R187 Wirewound Resistor 0.018 Ohms 3W 5% Axial

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Ww - 3W,5%,.018 Ohm Resistor

56R187 Wirewound Resistor 0.018 Ohms 3W 5% Axial

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56R187 Wirewound Resistor 0.018 Ohms 3W 5% Axial Through Hole

Wirewound resistors are commonly made by winding a metal wire, usually nichrome, around a ceramic, plastic, or fiberglass core. The ends of the wire are soldered or welded to two caps or rings, attached to the ends of the core. The assembly is protected with a layer of paint, molded plastic, or an enamel coating baked at high temperature. These resistors are designed to withstand unusually high temperatures of up to 450 °C. Wire leads in low power wirewound resistors are usually between 0.6 and 0.8 mm in diameter and tinned for ease of soldering. For higher power wirewound resistors, either a ceramic outer case or an aluminum outer case on top of an insulating layer is used – if the outer case is ceramic, such resistors are sometimes described as "cement" resistors, though they do not actually contain any traditional cement. The aluminum-cased types are designed to be attached to a heat sink to dissipate the heat; the rated power is dependent on being used with a suitable heat sink, e.g., a 50 W power rated resistor will overheat at a fraction of the power dissipation if not used with a heat sink. Large wirewound resistors may be rated for 1,000 watts or more.

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