Resistor Watts

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=83863
Printed Date: September 16, 2025 at 4:14 PM

Topic: Resistor Watts

Posted By: bgd73
Subject: Resistor Watts
Date Posted: October 08, 2006 at 12:34 PM

My radio needs a 1k ohm resistor on the power, what watts do I use. After a trip to radio shack, the .5watt 1kohm is a bit small. any ideas? I have found them up to 25 watt and many inbetween. Large to small. The radio is a 35x4 panasonic.

Replies:

Posted By: bgd73
Date Posted: October 08, 2006 at 12:43 PM

watts == amps x volts

I found it on the web

2.5x12== 30 watt resistor @ 1k ohm

I thank me for helping me :)

Posted By: fakepete
Date Posted: October 08, 2006 at 4:09 PM

why does it need a resistor?

Posted By: Flakman
Date Posted: October 08, 2006 at 11:27 PM

I, too am very much interested in why you need a resistor.

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The Flakman
I feel strange. I have deja vu and amnesia at the same time.

John | Manteca, CA

Posted By: aznboi3644
Date Posted: October 09, 2006 at 6:01 PM

But why for the power line??????

Posted By: Flakman
Date Posted: October 09, 2006 at 6:44 PM

Looks like several unanswered questions here.

-------------
The Flakman
I feel strange. I have deja vu and amnesia at the same time.

John | Manteca, CA

Posted By: Mad Scientists
Date Posted: October 09, 2006 at 8:59 PM

bgd73] wrote:

P>watts == amps x volts
I found it on the web
2.5x12== 30 watt resistor @ 1k ohm
I thank me for helping me :)

Let 'me' know that s/he got it wrong <grin>... to calculate wattage of a resistor you multiply the current through the resistor with the voltage *drop* across the resistor.. In addition to that, it's an impossibility to push 2.5 amps through a 1k ohm resistor with only 12 volts..

What are you trying to do?..

Jim

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