1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    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!

Basic Electricity (what i should know but don't)

  1. Jan 31, 2009 #1
    i have been given this question

    Figure 1 shows a graph of V against I for a filament lamp. Calculate the maximum resistance of the lamp over the range shown by the graph,

    now i have a somewhat vague attempt and its to measure the tangent of the line (i can't upload the graph sorry)

    how do i take a tangent of a curved line accurately and then calculate the maximum resistance


    thank you for your help
     
  2. jcsd
  3. Jan 31, 2009 #2
    You just need to take a little time and care drawing your tangent.The graph should be steepest at the origin where the resistance is highest..Draw your tangent as long as you can ,construct a right angled triangle where the tangent becomes the hypotenuse and divide the change of voltage by the change of current(tan theta)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Basic Electricity (what i should know but don't)
  1. I don't know why! (Replies: 4)

Loading...