this is very noobie question, please accept my apologies in advance.

Could someone be kind enough to tell me how to check for resistor
functionality?


I pulled the resistor and theres no writting on it other than R10.

Its an inline resistor.

I think it is defective as it got overly warm.

please advise.

"rutman" wrote in message
...
this is very noobie question, please accept my apologies in advance.

Could someone be kind enough to tell me how to check for resistor
functionality?


I pulled the resistor and theres no writting on it other than R10.

Its an inline resistor.

I think it is defective as it got overly warm.

please advise.

What does it measure in ohms?

N

HI

..07

I set my voltmeter at the "200" mark and touched both ends of the
resistor with the + - cable of my voltmeter. It read at .07


I did find a small number written on it. 15KW


thanks


On Thu, 12 May 2005 04:27:00 GMT, "NSM" wrote:


"rutman" wrote in message
.. .
this is very noobie question, please accept my apologies in advance.

Could someone be kind enough to tell me how to check for resistor
functionality?


I pulled the resistor and theres no writting on it other than R10.

Its an inline resistor.

I think it is defective as it got overly warm.

please advise.

What does it measure in ohms?

N

"rutman" wrote in message
...
HI

.07

I set my voltmeter at the "200" mark and touched both ends of the
resistor with the + - cable of my voltmeter. It read at .07
I did find a small number written on it. 15KW

It sure isn't 15 kW - maybe 15 kOhm? You need to measure it with the power
cord unplugged and with an ohmmeter.
--
N

Resistors are rated for resistance (ohms) and dissipation (watts). You are
only interested in the resistance figure. See:
http://www.allaboutcircuits.com/vol_6/chpt_2/2.html

This will tell you what it is. To find out what it should be you need
either the circuit diagram or the labelling on the resistor. See:
http://www.pmel.org/HandBook/HBpage26.htm

Your example might not fit any of the standard marking schemes.

A resistor might be designed to run quite warm, or warm running might
indicate a fault elsewhere in the circuit.
--
"rutman" wrote in message
...
this is very noobie question, please accept my apologies in advance.

Could someone be kind enough to tell me how to check for resistor
functionality?


I pulled the resistor and theres no writting on it other than R10.

Its an inline resistor.

I think it is defective as it got overly warm.

please advise.

"James Hahn" wrote in message
...
Resistors are rated for resistance (ohms) and dissipation (watts). You are
only interested in the resistance figure. See:
http://www.allaboutcircuits.com/vol_6/chpt_2/2.html

This will tell you what it is. To find out what it should be you need
either the circuit diagram or the labelling on the resistor. See:
http://www.pmel.org/HandBook/HBpage26.htm

Your example might not fit any of the standard marking schemes.

A resistor might be designed to run quite warm, or warm running might
indicate a fault elsewhere in the circuit.
--
"rutman" wrote in message
...
this is very noobie question, please accept my apologies in advance.

Could someone be kind enough to tell me how to check for resistor
functionality?


I pulled the resistor and theres no writting on it other than R10.

Its an inline resistor.

I think it is defective as it got overly warm.

please advise.





Dissipation is important if he is going to replace it



Cub

"Asimov" wrote in
:

"rutman" bravely wrote to "All" (12 May 05 04:20:22)
--- on the heady topic of "Noob question. How do you check a resistor?"

ru From: rutman
ru Xref: aeinews sci.electronics.repair:47927

ru this is very noobie question, please accept my apologies in advance.

ru Could someone be kind enough to tell me how to check for resistor
ru functionality?


ru I pulled the resistor and theres no writting on it other than R10.

ru Its an inline resistor.

ru I think it is defective as it got overly warm.

ru please advise.


Hi, noobie! ;-)

If the resistor let the smoke out then it was overly warm. If it still
looks intact then it is likely still good. Resistance is easily
measured with a dmm's ohm-meter range. I'm curious what that resistor
was used for? Resistors with wire terminal don't often have writing on
them, just a colour code. Surface mount types sometimes have writing.

A*s*i*m*o*v

(resistor colour code
(black, brown, red, orange, yellow, green, blue, violet, grey, white)
( 0 1 2 3 4 5 6 7 8 9 )

(resistor colour code nmemonic

... Bad Beer Rots Our Young Guts But Vodka Goes Well.



Or;
Bad Boys Rape Our Young Girls But Violet Gives Willingly.

--
Jim Yanik
jyanik
at
kua.net

"rutman" bravely wrote to "All" (12 May 05 04:20:22)
--- on the heady topic of "Noob question. How do you check a resistor?"

ru From: rutman
ru Xref: aeinews sci.electronics.repair:47927

ru this is very noobie question, please accept my apologies in advance.

ru Could someone be kind enough to tell me how to check for resistor
ru functionality?


ru I pulled the resistor and theres no writting on it other than R10.

ru Its an inline resistor.

ru I think it is defective as it got overly warm.

ru please advise.


Hi, noobie! ;-)

If the resistor let the smoke out then it was overly warm. If it still
looks intact then it is likely still good. Resistance is easily
measured with a dmm's ohm-meter range. I'm curious what that resistor
was used for? Resistors with wire terminal don't often have writing on
them, just a colour code. Surface mount types sometimes have writing.

A*s*i*m*o*v

(resistor colour code
(black, brown, red, orange, yellow, green, blue, violet, grey, white)
( 0 1 2 3 4 5 6 7 8 9 )

(resistor colour code nmemonic

.... Bad Beer Rots Our Young Guts But Vodka Goes Well.

In article ,
Asimov wrote:
Resistors with wire terminal don't often have writing on
them, just a colour code.

Wire wound - ie high power types - usually do, though?

--
*If I worked as much as others, I would do as little as they *

Dave Plowman London SW
To e-mail, change noise into sound.

In article , rutman
wrote:

I set my voltmeter at the "200" mark and touched both ends of the
resistor with the + - cable of my voltmeter. It read at .07


I did find a small number written on it. 15KW

"rutman" wrote in message
.. .
this is very noobie question, please accept my apologies in advance.

Could someone be kind enough to tell me how to check for resistor
functionality?


I pulled the resistor and theres no writting on it other than R10.

Its an inline resistor.

I think it is defective as it got overly warm.

Rutman-

A resistor's job is to convert electric current to heat. If it is still
getting hot, it is probably still good. If it overheats, the problem is
more likely something else that causes too much current to flow through
the resistor.

From your description, my "wild" guess is that it is a wire-wound power
resistor, possibly encased in ceramic. It might have a resistance of 0.1
Ohm (from the R10) and a power rating of 15 Watts.

However I suspect you may have misread your voltmeter, as 0.07 voltage
drop is not likely to be enough to make it hot. If it was actually 0.7
volts and the resistor was 0.1 Ohm, 7 Amperes would be flowing and it
would be burning 4.9 Watts. This would be within the 15 watt rating but
it would probably be too hot to touch. (If you Google for "Ohms Law" you
can check my calculations.)

Getting back to reality, you need to provide us a little more information
for a better answer. What kind of equipment is the resistor installed
in? You say it is an inline resistor. What is it in line with?

Does your voltmeter have other functions? If it has a resistance range,
it can check some resistors. However you must not connect it to a "live"
circuit or you will burn out the meter! If my guess is right about this
one's resistance, the meter may not be able to read it since the meter's
test leads could have more resistance than the resistor being measured.

Fred

"Jim Yanik" bravely wrote to "All" (12 May 05 14:40:41)
--- on the heady topic of " Noob question. How do you check a resistor?"

JY From: Jim Yanik .
JY Xref: aeinews sci.electronics.repair:47975

JY "Asimov" wrote in
JY g:

... Bad Beer Rots Our Young Guts But Vodka Goes Well.


JY Or;
JY Bad Boys Rape Our Young Girls But Violet Gives Willingly.


Jim,

But you would be accused of being sexist in our modern PC days. ;-)

A*s*i*m*o*v

.... From small chips to big breasts, silicone is great!

"Dave Plowman (News)" bravely wrote to "All" (12 May 05 16:15:51)
--- on the heady topic of " Noob question. How do you check a resistor?"

DP( From: "Dave Plowman (News)"
DP( Xref: aeinews sci.electronics.repair:47980

DP( In article ,
DP( Asimov wrote:
Resistors with wire terminal don't often have writing on
them, just a colour code.

DP( Wire wound - ie high power types - usually do, though?

Oh, the ceramic rectangles, right, was forgetting those. In fact it is
striking a bell in that op did mention 15KW. That's some big resistor
though even if it measures only R07!

A*s*i*m*o*v

.... Resistance Is Futile! (If 1 ohm)

He is not interested in measuring the dissipation. If he needs to replace
the resistor he needs to consider the dissipation of the replacement, as
well as other factors. He can face that issue when (if) the time comes.
--
"Cubzilla" wrote in message
...
snip

Dissipation is important if he is going to replace it

In article ,
Asimov wrote:
DP( Wire wound - ie high power types - usually do, though?

Oh, the ceramic rectangles, right, was forgetting those. In fact it is
striking a bell in that op did mention 15KW. That's some big resistor
though even if it measures only R07!

He mentioned it being marked R10. In the UK, this would suggest it was an
0.1 ohm resistor. So 0.07 ohms would be close given how poor many DVMs are
at measuring very low resistance.

--
*Dancing is a perpendicular expression of a horizontal desire *

Dave Plowman London SW
To e-mail, change noise into sound.

"rutman" wrote in message
...
this is very noobie question, please accept my apologies in advance.

Could someone be kind enough to tell me how to check for resistor
functionality?


I pulled the resistor and theres no writting on it other than R10.

Its an inline resistor.

I think it is defective as it got overly warm.



Are there no color bands on it? If it got too warm you'll have to find the
shorted part that caused it to get too warm in the first place or a new one
will do the same thing.