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Homework Help: How do I calculate wavelength?

  1. Apr 11, 2015 #1
    I've just begun learning physics for the first time. Please can anyone help me understand how to work through this problem?

    In an AC (Alternating Current) circuit, the current, I, measured in Amps (A) varies sinusoidally


    How can I calculate the wavelength of this current? Also, at what times will the current next reach its maximum and minimum values? And how can I estimate the maximum and minimum current from this graph?

    I wonder if the wavelength is 1/10?

    Is the time it next reaches its maximum peak 11 minutes? And 16 minutes for its minimum peak?

    Furthermore, is the minimum current -8A and the maximum current 8A?

    I'm not if these answers are correct as don't know how to work this question out. I unfortunately don't have a teacher I can ask as I'm an independent student.

    Please can anyone help me?

    Thank you very much!
  2. jcsd
  3. Apr 11, 2015 #2
    In an alternating current that current is as you say varying, reaching some maximum flow amount, then reversing and reaching the maximum amount in the opposite direction.
    You can't determine what the frequency is just by measuring the current, you would need a device intended for the purpose, typically an oscilloscope
  4. Apr 11, 2015 #3
    You'll not need to calculate to deduce the required info from the graph(waveform)
  5. Apr 11, 2015 #4


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