5ohm 20watt resistor

[shaiqbashir]

Hi guys!

well! i want a 5ohm-20watt power resisitor. First of all please tell me that whether this resistor is available , i mean that is this a standard resistor. And im having some problems finding this in the market. So please can anybody tell me some alternatives to this. I have heard from one of my friends that we can make a resistor according to our required resistance and wattage by using a coil wire by using the formula:

R=pL/A

well! by this i can find a required resistance but how to find a coil of the required power. that is 20 watts.

ur early reply shall be highly appreciated./

take carez

Regards,

 

[ante1]

Hi,

If you need exactly 5 Ohms (this one is 25 W) and surface mounting is ok here is an alternative: http://www.elfa.se/elfa-bin/setpage.pl?http://www.elfa.se/elfa-bin/dyndok.pl?lang=en&dok=1775.htm
If you can live with 4.7 Ohms (standard value) you have many options.

Hope this is helpful.

 

[shaiqbashir]

Thanks ante!

 

[MP1]

http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=3031&Row=380100&Site=US



MP

 

[ante1]

Hi MP,

Something went wrong here I think?

View attachment 38713

 

[MP1]

It looks like they do not keep the search criteria in the link for very long at Digikey. Hmmm....I did not know it expired.
It is a Digikey part number HLWB-5.0-ND. It is a 5.0 OHM 5% 20W TUBULAR Wire Wound Resistor @ US$ 3.38 for qty 1.

Here is the datasheet from the manufacuter, Vishay.
http://www.vishay.com/docs/30210/hlwnhlw1.pdf

Hope that is more helpful.

MP

 

[aartak]

Simply plug in parallel 10 resistors each 2Wt 50 ohm

 

[spuzzdawg]

Putting the ten 50 ohm resistors in parallel would give you an equivalent resistance of  200 milliohms not 5 ohms

 

[MP1]

Looks like you forgot to 1/x your sum. I am assuming you used the parallel formula and came up with 1/50+1/50+1/50....etc and came up with a sum of 0.2. Answer is actually 1/x, thus 1/0.2 = 5. Correct answer is 5.

MP

 

[salman signals]

Nice Stuff. keep it up.