voltage divider sanity check

Home / the12volt's Install Bay / Car Audio / voltage divider sanity check (

Topic Closed)

Welcome Guest :)

Members

Search

Register

Login

< Prev Topic Next Topic >

corrollaman

Member - Posts: 38

This member has made a donation to the12volt.com. Click here for more info.

Joined: November 17, 2009

Location: Kansas, United States

Posted: August 14, 2012 at 4:59 PM / IP Logged

Okay so Vout=Vin(Rtop/rbottom+Rtop

Facts:

All my resistors are 1\4 watt resistors.

Vin=12-14.4 volts

On one of my dividers I decided to use resistors I had on hand. 470 and 200.

I then did the math to find the Power Dissipated (Vin*Vin\Rtop+Rbottom)

I come up with .3 Watts

Sooo, I have read places that you want to use the smallest resistors, buttttt then my power dissipated goes up.. Should I just go to a 1\2 Watt resistor and call it a day??

ajm

Back to Top

i am an idiot

Platinum - Posts: 13,674

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: August 14, 2012 at 7:19 PM / IP Logged

It is .3 watts. But it will be divided (not evenly) among the 2 resistors. You will be fine.

Back to Top

corrollaman

Member - Posts: 38

Joined: November 17, 2009

Location: Kansas, United States

Posted: August 15, 2012 at 7:47 AM / IP Logged

Do you know the calculation to determine that Watts per resistor?

ajm

Back to Top

oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: August 15, 2012 at 9:57 AM / IP Logged

VxV/R or IxI/R

Back to Top

Sorry, you can NOT post a reply.
This topic is closed.

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

voltage divider sanity check

Sorry, you can NOT post a reply.This topic is closed.

Sorry, you can NOT post a reply.
This topic is closed.