We might suppose that the large inductor is close-wrapped, so that the interwinding capacitance largely cancels the inductive reactance at say 1 kHz leaving 60 ohms contribution in a series circuit of 60 ohms, 188 ohms due to the capacitor at 1 kHz, and 100 ohms, a total of 348 ohms so that the coil contributes 60/348 of 5 volts = 0.9 volts of the volts drop.
On Monday, April 18, 2022, 02:28:29 PM CDT, Carl Mungan via Phys-l <phys-l@mail.phys-l.org> wrote:
I’m doing an RLC lab tomorrow. I’m using a coil with an inductance of about 0.9 H and a resistance of about 60 ohms (both measured using a handheld meter). I connect it in series to a capacitor of 1 microfarad and an additional resistor of 100 ohms. So resonance is around 180 Hz. I use a Pasco function generator with an amplitude of about 5 V.
Measuring the voltage across the coil does give a peak around there. At low frequencies, the voltage goes to zero, but on the high-frequency end the voltage does not go to zero but instead levels off at quite a high value (maybe 1 V or more).
What’s the primary reason the voltage stays so high across the coil at high frequencies? (And when I say high, I mean above a few hundred hertz, not super high.)