1. Limited time only! Sign up for a free 30min personal 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!

Calculating Frequency.

  1. Feb 10, 2010 #1
    Hello my mind has gone blanc whilst in the middle of my AC Theory assignment.
    The question is:
    Calculate the frequencies for the following wave forms:
    i. An alternating current that completes 4 cycles in 5ms
    ii. An alternating current that completes 5 cycles in 8ms.

    Am I right in thinking work out how many ms to complete 1 cycle then work out using f = 1/T

    Can anyone point me in the right direction?

  2. jcsd
  3. Feb 10, 2010 #2


    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hello Dave! Welcome to PF! :wink:
    Yup! :biggrin:

    Well … sort-of … if it's 1 cycle in T milliseconds, then it's 1000 cycles in T seconds, so it's … ? :smile:
  4. Feb 10, 2010 #3
    frequency is usually in Hz so you need first to convert the time from ms to s .. the second thing is that what you are thinking is right,but there is an even easier direct way .. Why just dont you say that the frequency (f) = no. Of cycles / time .. :) then you will have the problem done..
  5. Feb 10, 2010 #4


    User Avatar
    Homework Helper

    Hi daveiejbeer, welcome to PF.
    Frequency f = no. of cycles per second.
    In the first case convert ms to s and find f.
  6. Feb 10, 2010 #5
    Thanx for your help. I have already worked out the answers but I wasn't converting it into seconds, Doh!

    Thanx once again.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Calculating Frequency.
  1. Calculating Frequency (Replies: 6)