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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?

    Dave
     
  2. jcsd
  3. Feb 10, 2010 #2

    tiny-tim

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    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

    rl.bhat

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    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.

    Dave
     
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