it is easy to read the resistance of a resistor, but to identify its watts is difficult, so i need help. please explain it briefly.
what resistor i am pertaining to are the color-coded resistors, and it said to have an indicated watts in it. how could i know its watts if it not indicated in the resistor itself and it only have colors?
explain the proper steps on how i could compute the watts if it has solution to make. please answer properly, share your sources, and give me enough information.
thanks a lot! god bless...............
what resistor i am pertaining to are the color-coded resistors, and it said to have an indicated watts in it. how could i know its watts if it not indicated in the resistor itself and it only have colors?
explain the proper steps on how i could compute the watts if it has solution to make. please answer properly, share your sources, and give me enough information.
thanks a lot! god bless...............
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Only the higher wattage wire wound or sand composition resistors are labeled with printed wattage values (and ohms plus tolerance). I have never heard of a color code for wattage on 1 watt or below. It is according to size and is defined for each wattage and resistance (see http://en.wikipedia.org/wiki/Resistor Industrial type designation). Basically, you get to know what wattage they are by experience. Or, by looking on the bag of resistors from Radio Shack of assorted resistance values of a particular wattage.
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There is no indication of power rating on a colour-coded resistor. The biggest clue is its size. With experience you may be able to tell whether it's a carbon film or metal film resistor, which have different power ratings for the same size resistor.
The best way to do it is to measure it then check electronic suppliers' websites for a resistor that looks the same and is the same size.
The best way to do it is to measure it then check electronic suppliers' websites for a resistor that looks the same and is the same size.
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Generally the physical size determines the wattage. For resistors under 5W which do not have the wattage printed on them you eyeball them. The sizes are distinctive enough that once you see the differences between them you can distinguish the different sizes.
Otherwise you have to use data sheets and a set of callipers to measure their dimensions and compare to the data sheet.
http://www.seielect.com/Catalog/SEI-cf_c…
Otherwise you have to use data sheets and a set of callipers to measure their dimensions and compare to the data sheet.
http://www.seielect.com/Catalog/SEI-cf_c…
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Color coded resistor has 1/8 w ; 1/4 w ; 1/2 w ; 1w ; 2w and 3w. And it never exit more than 3 watts.
By compare the size of same type color coded resistor, it can be told its wattage rate. That require practice experience. To calculate its wattage in a circuit, use formula W = EI then multiple a factor of 2 or more to choose the right size of resistor (wattage) in that circuitry.
By compare the size of same type color coded resistor, it can be told its wattage rate. That require practice experience. To calculate its wattage in a circuit, use formula W = EI then multiple a factor of 2 or more to choose the right size of resistor (wattage) in that circuitry.
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The power of a resistor is NOT written on it, unless it's a big (in size) white one.
The smallest resistors are 1/4 watt.
Little larger resistors are 1/2 watt.
The power has nothing to do with its value (colors).
I mean the common resistors (with axial leads), not the SMT.
The smallest resistors are 1/4 watt.
Little larger resistors are 1/2 watt.
The power has nothing to do with its value (colors).
I mean the common resistors (with axial leads), not the SMT.