How Nichrome wire leads among various resistance wires

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How Nichrome wire leads among various resistance wires

The nichrome wire is represented in the grades of Nickel and Chromium by 80 to 20 ratio, 60 to 15 and nikrothal 60 wire. Nichrome introduces bright surface wire with precise resistance. The nichrome resistance wire is used in the domestic applications such as toaster, oven heater etc. The nichrome wire offers consistent resistivity as well as it has low coefficient of temperature expansion, its inoxidizability is better and offers long life. Moreover the wire is quite economical and has number of benefits among the resistance wires used in the industry.

Basically there are several resistance wires made of alloys of various metals to provide specialized resistance. Mostly the resistance wire is utilized in the heating tasks however many times it becomes essential that the resistance value doesn't change the heating property of the wire. In certain cases the wire is required to be insulated though under the extremely high temperatures the covers becomes worthless. Therefore in order to insulate the resistance wire , nichrome is specially treated to produce the strong oxidized film on the surface.

The oxide film is particularly of black color and it is considered as the superior insulation material for the nichrome wire.

The different resistance wires are explained following:

Constantan: If you require a resistor of 10 ohmic value, it needs to offer the same resistance even in the cold or warm conditions. In such situations alloy constituting of 56% copper and 44% nickel is utilized that offers almost constant resistance in the variable temperature conditions. The alloy wire is silvery in color and doesn't readily get oxidized moreover it can be soldered easily. Such combination of nickel and copper is called constantan, cuprothal, eureka, advance, ferry and more.

Such wire can be warmed to extremely hot but it can be soften at the red temperatures.

MANGANIN: The MANGANIN alloy offers no change in its resistance with the alteration in temperature. However it is costly but performs better as compare to Constantan and widely used in the designing of meter shunts and in the industrial equipments as well as resistance coils.

The Constantan resistance wire has the following specifications:

Diameter mm	SWG	Closest B&S	Ohms / metre	Approx metres on 50g reel
2.03	14	12 (2.05mm)	0.151	1.7m
1.62	16	15 (1.45mm)	0.237	2.7m
1.22	18	16 (1.29mm)	0.420	4.7m
0.91	20	19 (0.91mm)	0.747	8.5m
0.71	22	21 (0.72mm)	1.234	14.1m
0.56	24	23 (0.57mm)	1.997	22.7m
0.46	26	25 (0.45mm)	2.987	34.0m
0.38	28	27 (0.36mm)	4.413	50m
0.32	30	28 (0.32mm)	6.288	71m

Nichrome: In order to fulfill the heating requirements when the consistent value of resistant is not essential, then Nichrome comes into existence. It consists of 80% nickel and 20% chromium and it cannot be soldered easily. As the soldering melts upon hating of nichrome wire it is often welded to other metals to make electrical connections. As compare to constantan nichrome is tougher to bend and it offers almost twice resistance per meter. The nichrome can operate under extremely high temperatures such as the red hot conditions and the alloy's resistance increases with the increase in temperature.

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