I irfan bangash New Member Feb 11, 2012 #1 How to check resistor watt ? some R is big or some R size is small , how i chk R is 1watt 2watt 1/2watt 1/4watt ?
How to check resistor watt ? some R is big or some R size is small , how i chk R is 1watt 2watt 1/2watt 1/4watt ?
cowboybob Well-Known Member Most Helpful Member Feb 12, 2012 #2 For the most part it is a matter of size (diameter) These are approximations, but fairly close estimations. A resistor that has a diameter more or less the equivalent to the spray tube of an aerosol can is probably 1/8W. Each successive doubling in size are 1/4, 1/2 and 1W.
For the most part it is a matter of size (diameter) These are approximations, but fairly close estimations. A resistor that has a diameter more or less the equivalent to the spray tube of an aerosol can is probably 1/8W. Each successive doubling in size are 1/4, 1/2 and 1W.
crutschow Well-Known Member Most Helpful Member Feb 12, 2012 #3 Look up a similar physical size resistor and note its power rating. That will be the rating of your resistor.
Look up a similar physical size resistor and note its power rating. That will be the rating of your resistor.
ronsimpson Well-Known Member Most Helpful Member Feb 12, 2012 #4 The 1% resistors are usually one size bigger than 5% parts.
crutschow Well-Known Member Most Helpful Member Feb 12, 2012 #5 ronsimpson said: The 1% resistors are usually one size bigger than 5% parts. Click to expand... Good point.
ronsimpson said: The 1% resistors are usually one size bigger than 5% parts. Click to expand... Good point.