Electricity Help !

  • #1
jmatthews1991
17
0

Homework Statement



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?

Homework Equations





The Attempt at a Solution


I feel like I am missing a variable. Help Please !
 

Answers and Replies

  • #2
willem2
2,085
346

Homework Statement



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?

Homework Equations





The Attempt at a Solution


I feel like I am missing a variable. Help Please !

No, you have everything you need.
Suppose the resistor draws a current I, what is the power it dissipates?
 
  • #3
jmatthews1991
17
0
P=vi
 
  • #4
jmatthews1991
17
0
still very confuesed
 
  • #5
willem2
2,085
346
P=vi

now give a formula for the power with only I and R in it (wich are known).

hint: ohm's law
 
  • #6
jmatthews1991
17
0
P=(IR)I ! ! ! ! Thank you so much !
 

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