Wire Wound resistors

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i_got_a_mohawk · #1 Post by **i_got_a_mohawk** » Sat Mar 03, 2007 12:38 pm

Im having a bit of trouble finding a 20 watt 4ohm wire wound resistor.

Closest ive found on this side of the pond is 10 watt wire wound resistors, they have 2.2 ohm 10 watt resistors at maplin (well, 2.2R, but, if my memory of electronics serves me right 2.2R is 2.2 ohms?).

So would it be possible to wire two x10 watt 2.2 ohm resistors in series to give a 20 watt 4.4 ohm resistance overall?

Or would this just not work?

(sorry for all the questions, just want to make sure i get this right!)

#2 Post by **Bill Fitzmaurice** » Sat Mar 03, 2007 1:23 pm

It should prove adequate, but the power will remain 10 watts. No matter, that's enough. I understand Maplins isn't the best source for materials, try Farnell and WLE.

i_got_a_mohawk · #3 Post by **i_got_a_mohawk** » Sat Mar 03, 2007 1:56 pm

Ah right, my bad, my physics really isnt up to scratch !

Ill try those other sources, Maplins was a bit of a last resort, i was looking at thier cabinet hardware and then found it all elsewhere for less than half the price!

i_got_a_mohawk · #4 Post by **i_got_a_mohawk** » Sat Mar 03, 2007 2:27 pm

Im not finding anything exactly right, however, farnell have some:

http://uk.farnell.com/jsp/search2/brows ... tid=308220

would two of these in parallel work?

(the only 4ohm one they had was only 3 watts, they also have 4.7 ohm ones that are 20 watts tho)

#5 Post by **Bill Fitzmaurice** » Sat Mar 03, 2007 3:32 pm

i_got_a_mohawk wrote: http://uk.farnell.com/jsp/search2/brows ... tid=308220

would two of these in parallel work?

(the only 4ohm one they had was only 3 watts, they also have 4.7 ohm ones that are 20 watts tho)

I'd keep looking, those are overkill, way overpriced for what you need, and out of stock anyway.
The thought of no good sources in the UK for parts must have G.A. Briggs doing cartwheels.

Mike M · #6 Post by **Mike M** » Sat Mar 03, 2007 8:03 pm

http://uk.farnell.com/jsp/endecaSearch/ ... KU=1112074

i_got_a_mohawk · #7 Post by **i_got_a_mohawk** » Mon Mar 05, 2007 2:31 pm

How much of a leah way do i have with the impedance of the resistor?