Results 1 to 2 of 2

Math Help - Electrical Maths Questions

  1. #1
    Junior Member
    Joined
    Nov 2007
    Posts
    26

    Electrical Maths Questions

    Well, 3 questions actually. See below.
    Please show me the working out and not just the answers.

    Thanks in advance!
    Attached Thumbnails Attached Thumbnails Electrical Maths Questions-lastscan.jpg  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by J4553 View Post
    Well, 3 questions actually. See below.
    Please show me the working out and not just the answers.

    Thanks in advance!
    For question 3 you are told that the resistance varies linearly with length and inversly as the square root of the diameter. That means there is a constant k (other things being equal) such that:

    R=\frac{k l}{\sqrt{d}}

    You are given the resistance, 30.9 Ohms of a 850 mm length of 0.122 mm diameter wire so:

    k=\frac{30.9\sqrt{0.122}}{850}

    when resistance is given in Ohms and length and diameter in mm.

    Now you know k you can use the first equation to find the resistence of any wire of the same material.

    RonL
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Maths function questions
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: March 22nd 2010, 02:32 PM
  2. Physics Questions (Electrical Energy)
    Posted in the Math Topics Forum
    Replies: 3
    Last Post: August 25th 2009, 09:21 AM
  3. Several maths questions
    Posted in the Algebra Forum
    Replies: 6
    Last Post: June 19th 2009, 07:52 AM
  4. 4 Quick Questions on Electrical Energy
    Posted in the Math Topics Forum
    Replies: 3
    Last Post: September 27th 2008, 11:29 PM
  5. maths questions
    Posted in the Advanced Algebra Forum
    Replies: 14
    Last Post: September 29th 2006, 11:59 AM

Search Tags


/mathhelpforum @mathhelpforum