Question

Name the materials which are used for making the standard resistor.

• A. Chromium
• B. Copper
• C. Nickel
• D. Tungsten

Answer 1

Answer: (A), (C)

The correct options are
A Chromium
C Nickel

Resistors are produced with a wide variety of materials and manufacturing processes. Each resistor material has its typical properties and specific areas of use. Below are a few types.

Wire-wound (WW):
These types are made by winding resistance wire in a spiral around a non-conductive core. The resistance wire is usually a nickel-chromium alloy and the core is often ceramic or fiberglass.

Carbon Composition (CCR):
The resistive element is made from a mixture of fine carbon particles and a non-conductive ceramic material. The substance is pressed in a cylindrical shape and baked. The resistance value depends on the dimensions of the body and the ratio between carbon and ceramic material.

Carbon Film:
A thin, pure carbon film is deposited on an insulating cylindrical core. A spiral cut is made in the film to increase the resistive path.

Metal Film Resistor:
Metal film resistors are usually made of Nichrome, but also other materials such as tantalum nitride is used. The resistive film is printed on a cylindrical or flat insulating substrate. The resistive material is a combination of a Ceramic material and a Metal, and therefore these resistors are also referred to as Cermet.
The main requirement for a resistor material is that it has to withstand high temperatures and ensure accuracy.

Hence correct option is A and C .