1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Electricity Help !

  1. Mar 23, 2010 #1
    1. The problem statement, all variables and given/known data

    The power rating of a resistor is 0.256 W. If the value of the resistor is 210 Ω, what is the maximum current it can draw?

    2. Relevant equations

    3. The attempt at a solution
    I feel like I am missing a variable. Help Please !
  2. jcsd
  3. Mar 23, 2010 #2
    No, you have everything you need.
    Suppose the resistor draws a current I, what is the power it dissipates?
  4. Mar 23, 2010 #3
  5. Mar 23, 2010 #4
    still very confuesed
  6. Mar 24, 2010 #5
    now give a formula for the power with only I and R in it (wich are known).

    hint: ohm's law
  7. Mar 24, 2010 #6
    P=(IR)I ! ! ! ! Thank you so much !
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook