I enjoy the electronics videos by YouTube user AllAmericanFiveRadio but I came across one the other day that he did on frequency and impedance that seemed completely contrary to my understanding of what impedance does to a signal. In this video https://www.youtube.com/watch?v=TRSNKwtUy8g he increases the frequency of a signal through several components individually and measures the impacted waveform with an oscilloscope.
When he uses a resistor, the signal amplitude does not change with frequency as expected.
With the coil (inductor) the signal amplitude is shown to increase as the frequency increases. I thought inductive reactance increased with frequency.
With the capacitor, the amplitude of the signal decreases as the frequency increases. I thought capacitive reactance decreased as the AC signal frequency increased.
Am I wrong? Is there some sort of inverse relationship occurring because of how he is measuring this?
I thought I had a solid grasp on this and now I am questioning my understanding because his demo illustrates the exact opposite of the behavior I expected. Can someone confirm or deny the validity of his demo. If he is correct, can you explain why? Thanks,
Ωhm
When he uses a resistor, the signal amplitude does not change with frequency as expected.
With the coil (inductor) the signal amplitude is shown to increase as the frequency increases. I thought inductive reactance increased with frequency.
With the capacitor, the amplitude of the signal decreases as the frequency increases. I thought capacitive reactance decreased as the AC signal frequency increased.
Am I wrong? Is there some sort of inverse relationship occurring because of how he is measuring this?
I thought I had a solid grasp on this and now I am questioning my understanding because his demo illustrates the exact opposite of the behavior I expected. Can someone confirm or deny the validity of his demo. If he is correct, can you explain why? Thanks,
Ωhm