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A Carbon film resistor can be identified by it's markings, there should be between 3-5 colored bands which are used to identify a resistor.
Also size doesn't always matter when it comes to electronics, although with carbon film resistors it does, the longer the piece of carbon film, the more resistance, though it usually doesn't take much.
Here's the link.
**broken link removed**
Note: Look VERY CAREFULLY at the resistor, some colors are difficult to distinguish like blue/green, and violet/blue, I know the last one sounds kind of funky, but one time it took me about 1/2 an hour to decide which one it was, I looked under many different lights, but didn't actually decide until I went out into sunlight (The best to identify colors under, other lights emit a slightly different color, like a yellowish/pale color which can impare your ability to identify some colors) and some of these bands can be under 1mm in size so a magnifying glass may help.
A Carbon film resistor can be identified by it's markings, there should be between 3-5 colored bands which are used to identify a resistor.
Also size doesn't always matter when it comes to electronics, although with carbon film resistors it does, the longer the piece of carbon film, the more resistance, though it usually doesn't take much.
Here's the link.
**broken link removed**
Note: Look VERY CAREFULLY at the resistor, some colors are difficult to distinguish like blue/green, and violet/blue, I know the last one sounds kind of funky, but one time it took me about 1/2 an hour to decide which one it was, I looked under many different lights, but didn't actually decide until I went out into sunlight (The best to identify colors under, other lights emit a slightly different color, like a yellowish/pale color which can impare your ability to identify some colors) and some of these bands can be under 1mm in size so a magnifying glass may help.
Note: Look VERY CAREFULLY at the resistor, some colors are difficult to distinguish like blue/green, and violet/blue, I know the last one sounds kind of funky, but one time it took me about 1/2 an hour to decide which one it was, I looked under many different lights, but didn't actually decide until I went out into sunlight (The best to identify colors under, other lights emit a slightly different color, like a yellowish/pale color which can impare your ability to identify some colors) and some of these bands can be under 1mm in size so a magnifying glass may help.
I know that. What I need to know is if is there any reference to determine the power.
E.g.:
Lenght: 10mm, Diameter: 1mm ----> 1/4W
Lenght: 20mm, Diameter: 3mm ----> 1W
etc....
look at the links i posted......the first one.....it has a chart that contains the dimensions of different power resistors.
i think that the dimensions don't matter from different manufacturers
look at the links i posted......the first one.....it has a chart that contains the dimensions of different power resistors.
i think that the dimensions don't matter from different manufacturers
i don't know about standards....,but the fact is that you will not find a 2 W resistor from one manufacturer the same size as a 1/2W resistor from another manufacturer....if you know what i mean/////
Yeah, but not everyone has a DMM, like me, I just haven't had much spare time to go get one, nor the spare cash, because if I get one, I'm probably gonna get one of the $100 that can measure voltage, resistance, capacitance, and all the extras, because I don't want to have to spend a whole lot of time trying to identify components.
I'm probably gonna get one of the $100 that can measure voltage, resistance, capacitance, and all the extras, because I don't want to have to spend a whole lot of time trying to identify components.
Good idea, a DMM that can measure the values of caps (along with resistance, voltage, current, and all the other standard stuff) is very worth the money...
As for the power of carbon resistors I would bet there is no set standard. Obviously size plays a factor, so good luck sbeyeta!!
Yes, the physical size is the only way to determing the power rating of a resistor. Although there is no set standard, most manufacturers pretty well stay close to each other in this regard. The "standard" sizes are for 1/16-watt through 2-watts only and then for carbon composition or carbon film only. Beyond 2 watts or if playing with metal film, wirewound or metal oxide, all "standard" bets are off!
I might add that although a 1/4-watt carbon film and 1/4-watt carbon composition resistor are about the same size and have the same power rating, they are NOT really the same in power rating. For continuous power dissipation, they'll both handle 1/4 watt. But for short bursts of power over the rating -- that is, pulsed power that may average out to 1/4 watt -- the composition resistor will handle it while the film resistor will smoke on you. The composition resistor has a lot more physical bulk in the resistance element and can absorb power surges while the film resistor is nothing more than a "skin" of carbon deposited on the surface of a ceramic slug and will flash with a surge of power.
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