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    Guidance on 5k ohm resistor
- rockp2
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                7 years 9 months ago                #16387
        by rockp2
    
    
            
            
            
            
            
                                
    
                                                
    
        Guidance on 5k ohm resistor was created by rockp2            
    
        Guys, I am seeking to buy some 5k ohm resistors to have to act as jumpers on certain component test like Paul recommends (Chp 7 & Chp 10).  But I don't know what wattage I should get?  Seems to be all over the map from 1/4 watt to much higher wattage.  It looks like there are several composite make ups of various type of resistors.  So what wattage and what type 5k ohm resistors am I looking for?  Also, it seems like there are a lot of 5.x ohm resistors, are they ok to used or does it need to be exactly 5k?  Does anyone have a website they order from they can share?  Thanks a ton.    
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- Andy.MacFadyen
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                7 years 9 months ago         -  7 years 9 months ago        #16388
        by Andy.MacFadyen
    
    
        
The Wattage is trivial
If you put a 5k resitor across 15v from V/R = I you only get 0.003 Amps
Power = I*I*R
0.003*0.003*5,000 = 0.045 Watts or 45mW
            
            
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        Replied by Andy.MacFadyen on topic Guidance on 5k ohm resistor            
    If you put a 5k resitor across 15v from V/R = I you only get 0.003 Amps
Power = I*I*R
0.003*0.003*5,000 = 0.045 Watts or 45mW
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
        Last edit: 7 years 9 months ago  by Andy.MacFadyen.            
    
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- Edke6bnl
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                7 years 9 months ago                #16414
        by Edke6bnl
    
    
            
            
            
            
            
                                
    
                                                
    
        Replied by Edke6bnl on topic Guidance on 5k ohm resistor            
    
        can you just leave a 5k resistor on a scanning tool for safety    
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- Coolbreeze
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                7 years 9 months ago                #16752
        by Coolbreeze
    
    
    
            
            
            
            
                                
    
                                                
    
        Replied by Coolbreeze on topic Guidance on 5k ohm resistor            
    
        Hello - I recently bought resistors on ebay -they were 5.1K ohm, 1/4 watt carbon resistors... the extra 100 ohms wont make any practical difference (its only 2% higher than the 5K). They were from Tayda Electronics-  Newark, Mouser and DigiKey are popular large suppliers also. The formula P=VI shows that I (current) on a 12 Volt system will be .021 amps (21 milliamps) if P is 0.25 watt. Many of the examples that Paul shows arent really pulling any amperage, so the 1/4 watt should be fine... one benefit of a higher wattage would be its physical size (easier to see/not lose) in low light conditions.    
    
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