How to Distinguish the Resistors?

Resistors have different styles and how to distinguish them clearly? They can be distinguished according to materials, function, etc. Today I will introduce the normal resistors below:
1. Wire wound resistors: 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.

2. Foil resistor: The primary resistance element of a foil resistor is a special alloy foil several micrometers thick, they have the best precision and stability of any resistor available. One of the important parameters influencing stability is the temperature coefficient of resistance (TCR).

3. Grid resistor: In heavy-duty industrial high-current applications, a grid resistor is a large convection-cooled lattice of stamped metal alloy strips connected in rows between two electrodes.

4. Carbon film resistor: Deposited on an insulating substrate, and a helix is cut in it to create a long, narrow resistive path. Varying shapes, coupled with the resistivity of amorphous carbon (ranging from 500 to 800 μΩ m), can provide a wide range of resistance values.

5. Metal film resistor: Metal film resistors are usually coated with nickel chromium (NiCr), but might be coated with any of the cermet materials listed above for thin film resistors. Metal film resistors' precision is higher than carbon film resistors, and stable, noise and TCR is small, usually widely used in instrument measuring appliances.

Of course, there are other resistors in this resistor industry, and too many electronics or equipments need resistors, customized resistors are also available according to industry requirements. Even the newest AI technology, high precision resistors are in great demand.