Welcome, please log-in to participate in this (your) forum, by logging in you agree to abide by the rules of this forum. Until you make your FIRST Login and post, you cannot PM a Member.

Antique Radio Forum for Collectors
HomeHome  RegisterRegister  Log inLog in  FAQFAQ  PublicationsPublications  SearchSearch  
Can't Log In?: 1st. thing is to clean out your cookies. if that doesn't work , go to our FAQs link above.


 Safe resistor wattage calculation

Go down 
Cliff Jones
Site Administrator
Site Administrator
Cliff Jones

Join date : 2010-11-22

Safe resistor wattage calculation Empty
PostSubject: Safe resistor wattage calculation   Safe resistor wattage calculation Icon_minitimeApril 10th 2018, 4:15 pm

Calculate the MAXIMUM Safe current through a resistor.


Joe has a 1.8K ohm resistor and it's rated at 0.5w

What is the maximum safe current through this resistor?

Let's use the formula P =  I X R^2

But let's rearrange the formula.

I = √P / R

So  √P/R = I

.5 / 1800 = .0003

√.0003 =.   .0167A  or  16.7mA

So with this formula Joe has determined that ½ watt resistor is safe for His application.

Easy enough right?

I'm a Science Thinker, Radio Tinkerer, and all around good guy. Just ask Me!
Back to top Go down
Safe resistor wattage calculation
Back to top 
Page 1 of 1
 Similar topics
» Improve your smile with porcelian veneers
» second thoughts
» Pain nearly 4 weeks out
» Calculation methods for FTFM problems

Permissions in this forum:You cannot reply to topics in this forum
ANTIQUE-RADIO-LAB :: Radio Repair Bench :: Electronic Formulas, Theory, and applications-
Jump to: