May 14, 2018 #1 L Longtom Newbie level 1 Joined Aug 7, 2014 Messages 1 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 7 I need a 11/2 ohm- 8 amp resister for a welder . How do I recognise it by colors?
May 14, 2018 #2 betwixt Super Moderator Staff member Joined Jul 4, 2009 Messages 16,236 Helped 5,140 Reputation 10,309 Reaction score 5,122 Trophy points 1,393 Location Aberdyfi, West Wales, UK Activity points 137,407 Resistors are not normally rated by current. Are you asking for a 1.5 Ohm resistor that will carry 8A? If so, you need a 1.5 Ohm 96W type: https://uk.farnell.com/w/c/passive-...-resistors?resistance=1.5ohm&st=resistor+100W You might find it easier to use two 3 Ohm 50W resistors in parallel (across each other): https://uk.farnell.com/w/c/passive-...unt-resistors?resistance=3ohm&st=resistor+50W Note that you can use a resistor with HIGHER power rating but not one with lower than 96W rating. Brian.
Resistors are not normally rated by current. Are you asking for a 1.5 Ohm resistor that will carry 8A? If so, you need a 1.5 Ohm 96W type: https://uk.farnell.com/w/c/passive-...-resistors?resistance=1.5ohm&st=resistor+100W You might find it easier to use two 3 Ohm 50W resistors in parallel (across each other): https://uk.farnell.com/w/c/passive-...unt-resistors?resistance=3ohm&st=resistor+50W Note that you can use a resistor with HIGHER power rating but not one with lower than 96W rating. Brian.
May 14, 2018 #3 KlausST Advanced Member level 7 Joined Apr 17, 2014 Messages 25,157 Helped 4,868 Reputation 9,757 Reaction score 5,536 Trophy points 1,393 Activity points 168,342 Hi, confusing information: 11/2 could be 5.5 ... who knows. But now you can do the calculation on your own ... according Brians post. Klaus
Hi, confusing information: 11/2 could be 5.5 ... who knows. But now you can do the calculation on your own ... according Brians post. Klaus
May 14, 2018 #4 FvM Super Moderator Staff member Joined Jan 22, 2008 Messages 52,399 Helped 14,748 Reputation 29,778 Reaction score 14,092 Trophy points 1,393 Location Bochum, Germany Activity points 298,000 Presume you aware now of the ambiguous specification and want to clarify it. Rheostats are sometimes rated by maximum current rather than power. In any case, power resistors have rarely color codes.
Presume you aware now of the ambiguous specification and want to clarify it. Rheostats are sometimes rated by maximum current rather than power. In any case, power resistors have rarely color codes.