| Electronics > Beginners |
| finding harvested resistors power rating |
| (1/5) > >> |
| gkmaia:
I harvested a bunch of resistors and I am now facing a question... what are the power rating for these resistors? Is there a test circuit capable of measuring how much power a resistor can handle? Therefor "measuring" it is power rating? |
| wraper:
Not possible. Same size resistors will heat to same temperature with same power applied. And power rating depends on their maximum temperature rating which you don't know. |
| T3sl4co1l:
Sort of possible. What do they look like, for starters? Tim |
| rsjsouza:
Apart from through hole carbon/metal film resistors that usually have well determined sizes between 1/16, 1/8, 1/4, 1/2, 1 and 2 Watts, it becomes quite difficult if you are talking about SMD. Similar scenario trying to find the voltage rating of SMD ceramic capacitors, for example. A good reference that can help you is at: http://www.resistorguide.com/resistor-sizes-and-packages/ |
| David Hess:
If they are common leaded film resistors, then they power derate to zero at about a 150C surface temperature. So applying enough power to raise them to that temperature will give a good estimate of their power capability. The same can be done for other resistor types if you can find a representative power derating curve for them. |
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