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previous: Chris Harden By my calcualtions, 5W should be mo... -- 6/21/2000 10:04 PM

Re: PT Cathode resistor rating?

6/22/2000 4:15 AM
Bruce	Re: PT Cathode resistor rating? 25 watts is absurd. He doean't understand or know that basic Ohm's law formula of I^2*R = power. The only reason to use anything over 1/2 watt is if you are a heavy handed soldering thug with a 140 watt Weller soldering gun and you overheat the 1 ohm resistor to the point it is .8 ohms or 1.2ohms or worse. Then your error factor will be high enough to wreck the whole measurement thing. I've used many 1/2 watt 1% 10 ohm resistors myself and have not blown one open yet. Bruce

6/22/2000 4:15 AM

Bruce

Re: PT Cathode resistor rating?

25 watts is absurd. He doean't understand or know that basic Ohm's law formula of I^2*R = power.
The only reason to use anything over 1/2 watt is if you are a heavy handed soldering thug with a 140 watt Weller soldering gun and you overheat the 1 ohm resistor to the point it is .8 ohms or 1.2ohms or worse.
Then your error factor will be high enough to wreck the whole measurement thing.
I've used many 1/2 watt 1% 10 ohm resistors myself and have not blown one open yet.
Bruce