text: # Electric current
  
  #### Dx
  
  Hiya!
  I have a problem thats got me confused to solve. I wanna use ohms law but not right. Here is the problem.
  
  A nichrome wire has a radius 0f .5 mm and resistivity of 100 x 10^-8 ohm.m. If the wire carries a current of .5 A what is the voltage across the wire? The length of the wire is .32m
  
  E = .5A x 100 x 10^-8 ohm is what i have for setting it up but its not the answer. what do i need to do to solve for this?
  
  Dx
  
  Related Introductory Physics Homework Help News on Phys.org
  
  #### Tom Mattson
  
  Staff Emeritus
  Gold Member
  Originally posted by Dx
  A nichrome wire has a radius 0f .5 mm and resistivity of 100 x 10^-8 ohm.m.
  Note: You were given the radius and the resistivity. You were not given the resistance.
  
  E = .5A x 100 x 10^-8 ohm is what i have for setting it up but its not the answer.
  The problem is that you plugged the resistivity in for the resistance.
  
  what do i need to do to solve for this?
  Calculate the resistance, then use E=IR.
  
  #### Dx
  
  Re: Re: electric current
  
  The problem is that you plugged the resistivity in for the resistance.
  
  Calculate the resistance, then use E=IR. [/B][/QUOTE]
  
  Ok i have the .5A but no E or R to perform ohms law with how do i solve for this please Tom.
  
  Dx,
  
  #### Tom Mattson
  
  Staff Emeritus
  Gold Member
  Re: Re: Re: electric current
  
  Originally posted by Dx
  Ok i have the .5A but no E or R to perform ohms law with how do i solve for this please Tom.
  1. They ask you for E.
  2. They give you enough information to find R.
  
  Look up the deinfition of resistivity, and you will see how it is related to the dimensions of the wire. Come on, this is easy. You can do it.
  
  #### Dx
  
  So Happy!
  
  Thank You, Tom!
  
  You know i looked at that section numerous times but after taking a days break and reading what you wrote it was like a lightbulb lit up in my head. I cant believe I didnt see it earlier always the simple ones that seem to give me the most trouble.
  
  I found the formula R = p(L/A) then converted it to amps using ohms law.
  
  Much appreciated, you helped me alot!
  Dx
  
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explanation: The document is a discussion thread from a physics forum where a user named Dx is seeking help with a problem involving Ohm's Law and resistivity. The user initially presents a problem and an incorrect attempt at solving it. Another user, Tom Mattson, provides guidance on how to correctly approach the problem. Dx then responds with gratitude, indicating that they have understood the solution.
distilabel_metadata.content: Evaluate the user given text extract and determine if it contains a math question and optionally and answer to this question.
  
  Output rules:
  
  1. Briefly describe the document and mention if it contains a question or a question and answer.
  2. Finalize the output with: Label: no-question,question,question-and-answer,multiple-question,multiple-question-and-answer
distilabel_metadata.role: system
distilabel_metadata.content: # Electric current
  
  #### Dx
  
  Hiya!
  I have a problem thats got me confused to solve. I wanna use ohms law but not right. Here is the problem.
  
  A nichrome wire has a radius 0f .5 mm and resistivity of 100 x 10^-8 ohm.m. If the wire carries a current of .5 A what is the voltage across the wire? The length of the wire is .32m
  
  E = .5A x 100 x 10^-8 ohm is what i have for setting it up but its not the answer. what do i need to do to solve for this?
  
  Dx
  
  Related Introductory Physics Homework Help News on Phys.org
  
  #### Tom Mattson
  
  Staff Emeritus
  Gold Member
  Originally posted by Dx
  A nichrome wire has a radius 0f .5 mm and resistivity of 100 x 10^-8 ohm.m.
  Note: You were given the radius and the resistivity. You were not given the resistance.
  
  E = .5A x 100 x 10^-8 ohm is what i have for setting it up but its not the answer.
  The problem is that you plugged the resistivity in for the resistance.
  
  what do i need to do to solve for this?
  Calculate the resistance, then use E=IR.
  
  #### Dx
  
  Re: Re: electric current
  
  The problem is that you plugged the resistivity in for the resistance.
  
  Calculate the resistance, then use E=IR. [/B][/QUOTE]
  
  Ok i have the .5A but no E or R to perform ohms law with how do i solve for this please Tom.
  
  Dx,
  
  #### Tom Mattson
  
  Staff Emeritus
  Gold Member
  Re: Re: Re: electric current
  
  Originally posted by Dx
  Ok i have the .5A but no E or R to perform ohms law with how do i solve for this please Tom.
  1. They ask you for E.
  2. They give you enough information to find R.
  
  Look up the deinfition of resistivity, and you will see how it is related to the dimensions of the wire. Come on, this is easy. You can do it.
  
  #### Dx
  
  So Happy!
  
  Thank You, Tom!
  
  You know i looked at that section numerous times but after taking a days break and reading what you wrote it was like a lightbulb lit up in my head. I cant believe I didnt see it earlier always the simple ones that seem to give me the most trouble.
  
  I found the formula R = p(L/A) then converted it to amps using ohms law.
  
  Much appreciated, you helped me alot!
  Dx
  
  ### Physics Forums Values
  
  We Value Quality
  • Topics based on mainstream science
  • Proper English grammar and spelling
  We Value Civility
  • Positive and compassionate attitudes
  • Patience while debating
  We Value Productivity
  • Disciplined to remain on-topic
  • Recognition of own weaknesses
  • Solo and co-op problem solving
distilabel_metadata.role: user
distilabel_metadata.raw_output_q_a_detector_0: The document is a discussion thread from a physics forum where a user named Dx is seeking help with a problem involving Ohm's Law and resistivity. The user initially presents a problem and an incorrect attempt at solving it. Another user, Tom Mattson, provides guidance on how to correctly approach the problem. Dx then responds with gratitude, indicating that they have understood the solution.
  
  Label: question-and-answer