Electronic – What does a black band at the end of a resistor mean

resistors

I have a burned out big blueish gray resistor (probably a 1/2 or 1 watt) that I'm trying to find the value of but there is a mysterious black band at the end of the resistor where the tolerance band would be but obviously the tolerance/failure rate/temperature band cannot be black. What does it mean?

4.6mm x 15.5mm

I have confirmed colors:

Brown
Black
Gold
Gold
Black

So I think it's safe to say it's a 1 ohm, 5% tolerance. But what is that last black band!? It's driving me insane.

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Best Answer

revised

  • brown =1
  • black =0
  • gold = x 0.1
  • gold = 5%
  • black = non-inductive (bifilar wound WW)

is a 10x0.01= 1.0 Ohm 5% WW resistor.

enter image description here

If 0.9mm body length then 1W , if more then 2 or more.

The tempco is used by some non-wirewound types and black would be 300 ppm or the highest for non WW. rated tempco. If yours is non wire wound bet this.

otherwise...

enter image description here

While I’m at this again, get flame-proof if you like.

You can decide best on the colours that make sense from this example chart.