Are metal film resistors flameproof?

The resistive element comprises a metal oxide film deposited on a ceramic former. The element is protected by a flameproof coating which will withstand overload conditions without flame or mechanical damage.

What is the tolerance of carbon film resistor?

Typical tolerance values for carbon film resistors are 2, 5, 10, and 20%. Because of the use of pure carbon, the carbon film resistor has a higher negative temperature coefficient than carbon composition. The resistive temperature coefficient lies between 2.5×10-4 Ω/°C and -8×10-4 Ω/°C.

How is the resistance value of a carbon film resistor identified?

The colour bands on carbon and metal film resistors are used to identify the resistance value (in ohms) and tolerance (accuracy in percentage) of the resistor. The resistance value colour bands are crowded towards one end of the resistor and the last band is for the tolerance.

What is the difference between metal oxide and metal film resistors?

Metal oxide is a metallic compound, which is formed because of the chemical bonding between the oxygen atom and other elements. Metallic compound consists of two or more different types of atoms such as (tin with oxygen). In metal oxide film resistors, the film is constructed by using the tin oxide.

What are the disadvantages of carbon film resistor?

Disadvantages: Stability: The carbon composition resistor has a very poor level of performance in terms of stability. The value of resistance could change by as much as 5% in a year even if it is not in use. Heat could also change the value.

What is the difference between carbon metal resistor and film resistor?

The key difference between metal film and carbon film resistors is that metal film resistors use a metal film to limit the flow of electric current whereas carbon film resistors use a carbon film to limit the electric current flow.

What is the difference between metal film resistor and carbon film resistor?

How do you read a carbon film resistor?

CARBON FILM – RESISTOR VALUE – 4 Band Color Code For a good reading, we recommend to place the resistor so the tolerance band is in the right side. Both the 1st and the 2nd bands have the same color code, and they set the 1st and 2nd digit of our resistor’s resistance value.

What type of resistor should I use?

Resistor selection requires three steps: Determine the resistance and the watts to be dissipated by the resistor. Determine the proper “Watt Size” (physical size) as controlled by watts, volts, permissible temperatures, mounting conditions and circuit conditions.