the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

16 volt motor and resistor


Post ReplyPost New Topic
< Prev Topic Next Topic >
troy8143 
Member - Posts: 3
Member spacespace
Joined: May 18, 2011
Location: Florida, United States
Posted: May 18, 2011 at 10:54 PM / IP Logged  

I race drag slot cars and I am trying to reduce the voltage of my motor from 16v to 1v.

To be safe im going to assume it pulls about 4 amps at 16 volts. (64 watts)  At 1 volt I am assuming it will pull about .85 amps

Basically i need to pick out a resistor (or multiple resistors) that will not burn up, I dont know much about different resistors in anything more powerful than a small pocket amplifier.

What ohm rating and wattage would i need? where do i buy resistors?

oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: May 19, 2011 at 2:52 AM / IP Logged  
V=IR => R=V/I
R = (16-1)/.85 = 15/.85 = 17.6
Hence 18 Ohms (a preferred value).
P=VI = (16-1)*0.85 = 15*0.85 = 12.75W.
Hence 20 Watts (preferred size).
Hence an 18 Ohm 20W resistor based on your info.
(Likewise, the motor will have ~1.3% of the original ie, 1/75th the power from 1*0.85/16*4 = 0.85W/64W = 1/75)
troy8143 
Member - Posts: 3
Member spacespace
Joined: May 18, 2011
Location: Florida, United States
Posted: May 19, 2011 at 8:32 AM / IP Logged  
Thank you very much. I appretiate you showing the math with it. Now if i can just find one locally for less than 5$ ;)

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

  Printable version Printable version Post ReplyPost New Topic
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 Follow the12volt.com on Facebook
Wednesday, January 20, 2021 • Copyright © 1999-2021 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
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.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer