# By how much will a 26 Ohm resistance reduce 0.28A?

Discussion in 'General Electronics Discussion' started by JunkRoom, Dec 15, 2015.

1. ### JunkRoom

37
1
Jul 11, 2015
I'm thinking of picking up a "Fan Noise Speed Reduction Resistor Cable" with a resistance of 26 Ohms for a 12V fan that runs at 0.28A.

How much would 26 Ohms reduce the 0.28 amps?

Also, can it be used with a power source that varies it's output? (I read somewhere that resistors are okay as long as it's for a constant rather than a varying VOLTAGE?)

Hoping the underlying assumptions are sound & the question makes sense.

Also, apologies if my terminology's a little muddled.

Last edited by a moderator: Dec 16, 2015
2. ### Minder

3,016
640
Apr 24, 2015
The resistance of the fan = 43Ω so 43Ω in series with 26Ω = 69Ω which across 12v will = .17Ma.
I leave it to you to calculate how many volt drop is across each of the 43Ω & 26Ω.
Again, you need to brush up or understand Ohms law.
M.

3. ### JunkRoom

37
1
Jul 11, 2015
Thanks.

I just managed to track down some info. on the power source it'll be running on. It seems it provides a constant VOLTAGE of 8V (I had thought its speed was modulated according to the system's temperature). So I'm probably going to go with a simple molex pass-pass through and bypass the fan header entirely. :0/

But thanks again for the insight. :0)

Last edited by a moderator: Dec 16, 2015