Stupid Question: uF, mF

HolyDirt

New member
I've read a buncha stuff, and in one article it says they are the same thing... I was under the impression they were different. I thought a uF was 1/1000 of a mF, am I wrong? Are they the same?
 
Re: Stupid Question: uF, mF

HolyDirt said:
I've read a buncha stuff, and in one article it says they are the same thing... I was under the impression they were different. I thought a uF was 1/1000 of a mF, am I wrong? Are they the same?

Yeah . . . its one of those things I wish the manufacturers wouldn't do. I even have a hard time keeping up sometimes.

I believe its little "m" is the abbreviation micro-farad, (uf - .000001), while capitol "M" means milli-farad, (.001).

But like I said, even I get it mixed up. Tomorrow, at work, I'll toss both on a cap-meter and post back with a more definitive answer. ;)

Edit: Dang . . . I got it backwards. (Just checking the "book".)

Little "m" is the symbol for milli, (.001), and big "M" is the abbreviation for micro, (uf - .000001). The big "M" is unscientific, its like the commercial designation.
 
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Re: Stupid Question: uF, mF

ArtieToo said:
Yeah . . . its one of those things I wish the manufacturers wouldn't do. I even have a hard time keeping up sometimes.

I believe its little "m" is the abbreviation micro-farad, (uf - .000001), while capitol "M" means milli-farad, (.001).

But like I said, even I get it mixed up. Tomorrow, at work, I'll toss both on a cap-meter and post back with a more definitive answer. ;)

Edit: Dang . . . I got it backwards. (Just checking the "book".)

Little "m" is the symbol for milli, (.001), and big "M" is the abbreviation for micro, (uf - .000001). The big "M" is unscientific, its like the commercial designation.
Thanks buddy, it's good to know I'm not alone. :)
 
Re: Stupid Question: uF, mF

HolyDirt said:
I've read a buncha stuff, and in one article it says they are the same thing... I was under the impression they were different. I thought a uF was 1/1000 of a mF, am I wrong? Are they the same?

To answer your original question directly, you are correct.

1 uf is .001 of 1 mf. ;)
 
Re: Stupid Question: uF, mF

yeah, I remember walking into an electronics shop years ago and asking the shopkeeper for a 10 MICRO farad capacitor, because all I could find were the 10 MEGA farad caps, labeled with the big M... After he explained to me that his shop wasn't physically large enough to house a 10 megafarad capacitor, he kindly explained the big M to me.
 
Re: Stupid Question: uF, mF

Blue Calx said:
yeah, I remember walking into an electronics shop years ago and asking the shopkeeper for a 10 MICRO farad capacitor, because all I could find were the 10 MEGA farad caps, labeled with the big M... After he explained to me that his shop wasn't physically large enough to house a 10 megafarad capacitor, he kindly explained the big M to me.

:laugh2: :laugh2: :laugh2: Thats funny.

I forgot that "M" stands for Mega. Apparently, several large cap manufacturers have also. ;)
 
Re: Stupid Question: uF, mF

i have really really old astron paper caps on my bandmaster and they're labeled 25 MF. How does this translate to uf? I need to get those replaced since they're the ones linked to the power tranny.
 
Re: Stupid Question: uF, mF

I don't understand why they write code #s on caps? Like 224 =.022 uF
I THINK ? I have to go look at a chart to know for sure. :yell: Is there
a reason they can't just print the value? It's hard enuff just to remember
and read a resistor chart.
 
Re: Stupid Question: uF, mF

kmcguitars said:
I don't understand why they write code #s on caps? Like 224 =.022 uF
I THINK ? I have to go look at a chart to know for sure. :yell: Is there
a reason they can't just print the value? It's hard enuff just to remember
and read a resistor chart.

doesnt the 224 represent the value of the cap ? ... like, the '22' represents the value and the 4 represents how many places you have to move the decimal point ?
 
Re: Stupid Question: uF, mF

tone4days said:
doesnt the 224 represent the value of the cap ? ... like, the '22' represents the value and the 4 represents how many places you have to move the decimal point ?
A lot of times it varies. I've seen caps that are coded with scientific notation. For example: it say something like 323, it's 32 X 10^3. Other times, it uses a different system. Damn you caps, you have made my chaotic life slightly more confusing...
 
Re: Stupid Question: uF, mF

HolyDirt said:
A lot of times it varies. I've seen caps that are coded with scientific notation. For example: it say something like 323, it's 32 X 10^3. Other times, it uses a different system. Damn you caps, you have made my chaotic life slightly more confusing...
+1

tone4days said:
doesnt the 224 represent the value of the cap ? ... like, the '22' represents the value and the 4 represents how many places you have to move the decimal point ?
Exactly what I'm saying. Key word being REPRESENTS! I don't wanna think
about moveing decimals around. I'm sure there's a Scientific reason for
why they mark caps in this way. But my head is already filled with
useless Information. :smack:
 
Re: Stupid Question: uF, mF

the 3rd number is the number of zeros to rate the capacitance in pF.

224 means 220000 pF

:smack:
 
Re: Stupid Question: uF, mF

Stevo said:
the 3rd number is the number of zeros to rate the capacitance in pF.

224 means 220000 pF

:smack:

Exactly. So 224 = .22uf. They do precision resistors the same way: 503 = 50k.
 
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Re: Stupid Question: uF, mF

Blue Calx said:
yeah, I remember walking into an electronics shop years ago and asking the shopkeeper for a 10 MICRO farad capacitor, because all I could find were the 10 MEGA farad caps, labeled with the big M... After he explained to me that his shop wasn't physically large enough to house a 10 megafarad capacitor, he kindly explained the big M to me.

I assume this wasn't a Radioshack? The last time I went to RS looking for a specific part (a potentiometer), they had no idea what I was talking about...though they did seem to know a lot about Sprint cellphones. :laugh2:
 
Re: Stupid Question: uF, mF

mrid said:
I assume this wasn't a Radioshack? The last time I went to RS looking for a specific part (a potentiometer), they had no idea what I was talking about...though they did seem to know a lot about Sprint cellphones. :laugh2:
:laugh2: Your Not Kidding. I went to RS looking for a 8 pin IC socket. They
told me`We don't have anything like that here' I walked into the back and
there they where $1.49 for 2 :duh: Then they tried to sell me a Cell phone!!
I'm old enuff to remember the good Ole' Mom&Pop electronics store. You
could bring your tubes in and test them in a machine !! Thanks to RS..they
are no more. :saeek: NO WAY ,You can buy anything at RS without saying..
NO THANK'S!! I already have a CELL PHONE !! :laugh2:
 
Re: Stupid Question: uF, mF

it's always handy to have a multimeter on your desk.. allthough you're screwed when trying to look at a board LOL
i got a ****load of these litle parts around here and they got about 3 or 4 diferent labels
 
Re: Stupid Question: uF, mF

HolyDirt said:
A lot of times it varies. I've seen caps that are coded with scientific notation. For example: it say something like 323, it's 32 X 10^3. Other times, it uses a different system. Damn you caps, you have made my chaotic life slightly more confusing...

Damn, this thread makes me think of my physics course, (I just took a test this week on electricity and simple circuits) We do conversions in scientific notation using the Farad (F) as the basic unit of capacitance, here's some conversions for you guys :22:

1MF (megaFarad) = 10^6 F (1 000 000 F)
1kF (kiloFarad) = 10^3 F (1 000 F)
1mF (milliFarad) = 10^-3 F (.001 F)
1uF (microFarad) = 10^-6 F (.000 001 F )
1nF (nanoFarad) = 10^-9 F (.000 000 001 F)
1pF (picoFarad) = 10^-12 F (.000 000 000 001 F)
 
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