Parallel AC Circuit Analysis (Full Lecture)

In this lesson we'll examine fundamental electrical properties of parallel AC circuits. We'll learn that voltage across elements in parallel is the same. Additionally, we'll examine Kirchhoff's Current Law as applied to parallel AC circuits which states that the sum of currents entering a node equals the sum of currents leaving a node. Finally, we'll examine the influence of shorts and opens in parallel AC circuits. (Full Lecture)

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[Festus]

Nice video: One question that no one ever addresses is WHERE does the transition from one current to another occur in an RLC circuit? For instance, where exactly does the Total current with its phase angle transition to the Resistor current with zero phase angle? Does this occur inside the passive element or in the wire before/after the passive element? Thanks

[Festus]

Very Nice video. Thanks a lot for the effort involved.

[Festus]

At11:26 There is an apparent error. You have the Zt value the same as the 1/Zt value. The Zt value is correct. The 1/Zt value should be 1/0.002225 at an angle of 26 degrees.

[Vk-gvsc]

I love your videos...keep it up and Please do videos on transients and resonace...

[bernardmarukutu]

Thank you so much . From the University of Johannesburg . 😅 Just do the whole EEE syllabus .

[Jnglfvr]

Not sure why you're claiming at 15:34 that there is no voltage drop across the open capacitor limb just because there is no current. No current is needed to experience a voltage drop. By KVL there MUST be a voltage drop across that open limb equal to the voltage rise through the voltage source. The "top" of that limb is at precisely the same voltage as at the top of the inductor and resistor. The bottom of the that limb is at reference (0) volts. This is no different than calculating V thevenin across two terminals. The only way there would be no voltage drop across that limb is if there were a short circuit there.

[Deus]

Your videos are incredibly helpful, I feel like I comment on every single one I end up watching. Anyways, why is it that when you use the formula for total impedance using the sum of reciprocals, take in the case of 3:04, that when I take the reciprocal of that sum I end up with lens 234.3 with a phase of +62.1? Should I know intuitively that it's negative because we're dealing with a capacitor?

[bandwagon]

Hi Jim I have a question at around 13:21. Why does the ammeter just assume/accept that the current is travelling in a clockwise direction? Being ac current, wouldn’t it alternate clockwise and CCW 60 times a second? I’m which case the ammeter B will sometimes also measure the current solely bound for the 500 ohm resistor? What am I missing or assuming incorrectly?

[alanmoreno]

when I find Z total for some reason i keep getting 173.33 on the very beginning of the video. You think you could explain how you got what you did? It would be a big help!