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Video: Understanding Impedance

By on June 18, 2015
understand impedance








This video was recommended by Lee Davey which talk about understanding electrical impedance. Kindly check it out.



  1. Robert Calk

    June 19, 2015 at 9:54 pm

    I am subscribed to Ben's channel. He has a lot of great and interesting videos. But he doesn't explain how he gets the results on his calculations. I grabbed a calculator and tried various ways of calculating for the resistors and never got the numbers that he claims it is for the resistance.

  2. Rajeev

    June 20, 2015 at 9:05 pm

    My LG CRT TV has some problem like when switch ON the TV its power LED blink with tic tic sound and no picture seing.After a few second its LED will be off and also sound will be off.what is its cause and bow will be rectified it.

    • Jestine Yong

      June 22, 2015 at 7:23 am

      Hi Rajeev,

      Have you checked if the output voltages from the power supply good and stable?


  3. Chris

    August 19, 2015 at 12:36 am

    Robert Calk:
    I checked too the math and I can say the calculation is closely as Lee Davey explain. He got a small mistake in the first formula bat he say, does the source voltage is 120V and there are a dissipation of 2V because of the LED. So I would make this formula just for better understanding:
    R=(Usource - Uled)/Iled
    Usource is the input voltage of the voltage source to the circuit
    Uled is the voltage what the LED need
    Iled is the current what the LED need

    I think he rounded the results in ohm because the true results are not possible to get in real resistor values.
    So he changed the result to the nearest real resistor values.
    If he does it so than he should tell that!

    In my calculation for the resistor I got 6555.55 Ohm and I got the Xc=5643.
    So I think its pretty good.


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