metal film or carbon film?


the following are some details of the resistors. these are exactly what I read on the resistors.

1. 5 colour bands
2. 6 colour bands
3. JV-8K2, single yellow band
4. 1X-22R, single yellow band
5. 4 colour bands
6. FAC-1K1, single blue band
7. GWC-10K, single blue band
8. GXC-48R7, single blue band
9. GAC-56K2, single blue band
10. GU-150K, no colour band
11. GXC-3K83, single blue band

i do not have a digi-cam. so i am not able to show the pictures.
All very amusing.

Ever considered that metal is magnetic, carbon is not.
The body of a metalfilm sticks to a magnet, the leads generally do not as most leads are tinned copper.
Even MOX metaloxide bodies stick to a magnet.
None of the Vitrohm, Amroh, or Allan Bradley's carbon composites i have do


  • metal  and carbon.jpg
    metal and carbon.jpg
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True, nickel-chrome is not ferromagnetic.

Neither is a metaloxide layer, nor a carbon resistance track, a ceramic body, tinned copper or alloy leads.
The carbon composition resistors do not have end caps.
All of the carbon film resistors i have do not seem to have nickel-ferro end caps.
I know Beyschlag(Vishay BC / Philips BC) makes/made 2% accurate carbon films that look almost identical to the metal films they produce.

One way of finding out could be to check the TK value.
Regular low power metal films have a TK of 50, carbon films are in the order of TK = 200.
Yageo MF series have a TK of 25.
A reason for not using carbon films.

Any one of you have an idea how to check the power rating of a resistor, 1/4W, 0.4W, 1/2W, 0.6W, without having to destroy it ?

you are right that it is far easier to just open up a couple.
i was merely wondering if there is a neat way of measuring the temperature of a resistor under load.
(i only buy resistors with a datasheet)

0.4 watt Yageo's are half the size of a 0.4 watt Beyschlag Components metal film resistor.