Jump to content
Electronics-Lab.com Community
Sign in to follow this  
flippityflop

making sure the under-watt-ed resistor survives

Recommended Posts

a simple question...
so i have to create 8A DC for a very simple section of a circuit for 2-3 seconds. it draws it's power from the 120 VAC mains.

i will rectify the AC and condition it witha capacitor, but i cannot use a voltage regulator and/or a transformer before or after the rectification (don't ask).

so, i'll simply use a resistor to drop the voltage by 72V. the remaining, to the load, so the whole current is 8A. also, the load needs no regulation.

the question is, can this resistor:
(http://www.digikey.ca/product-detail/en/PF2472-8R2F1/PF2472-8R2F1-ND/2448327)
handle nearly 600W, when this is only specified for 100W, considering it will only be conducting for only 2-3 seconds?

duty cycle is 1-2 every other hours, just in case if the resistor will deteriorate anyways, i have an estimate how long it will last.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...