Joe, you are a Legend, thank you for the videos. They are clear, concise and accurate. Job brilliantly done Sir !
@ianclark81945 жыл бұрын
Absolutely THE best resource for principles on the internet.....
@JoeRobinsonTraining5 жыл бұрын
Aw, thanks Ian, you're too kind. 👍
@tedhayton23023 жыл бұрын
I just identified the inductance of a large unlabelled radio PSU choke using this method with a variac for the AC supply. Concise and brilliant Thank you.
@eliemutia46202 жыл бұрын
brilliant explanation sir
@JoeRobinsonTraining2 жыл бұрын
Thank you kindly. 😁
@no_short_circuit5 жыл бұрын
Thanks Joe, this video follows nicely from the last in the AC Theory series. I have to accept from you that your students need fairly detailed explanations of how to transpose in basic algebraic formula. I would have thought that anyone studying AC theory at this level would have already had those skills. Looking forward to next Sunday.
@JoeRobinsonTraining5 жыл бұрын
You would be staggered at the lack of mathematical ability that some learners join us with, even basic algebra can be challenging for them. It's a large part of what drives me to make content for my channel.
@abdulmumin62512 жыл бұрын
@@JoeRobinsonTraining Joe im one of them hand on heart I've learnt more from your videos in 4 weeks than I have learnt in class this whole year. Wont lie if I don't understand something I'm to shy to say. U explain everything so well. I didn't know algebra formulas on impedance or lighting stuff or star delta phase current inductive reactants im absolutely buzzing just wish I found ur channel a year ago im playing catch up now. Have 6 weeks to do a years work
@deanedgx4 жыл бұрын
great series of videos Joe. I'm refreshing my elec theory in order to try and get back into elec engineering. cheers.
@JoeRobinsonTraining4 жыл бұрын
Cheers. Glad they're helpful!
@kabandajamilu90364 жыл бұрын
So nice and educative sir
@dja.selekta10 ай бұрын
Fella, You’re a godsend. Recently started unit 202, I had been watching these videos before I enrolled.. Thank you. I owe you a few pints 😂
@JoeRobinsonTraining10 ай бұрын
You owe me precisely nothing sir! 😃 But if it brings you joy, feel free to buy me some coffee. ☕😊 www.buymeacoffee.com/joertraining
@myway8524 жыл бұрын
Great content
@stikndip3 жыл бұрын
As I understand it, the resistance and the impedance in the coil would be considered to be in series as your Pythag calculation describes an impedance triangle. Correct me if I'm wrong. Brilliant content btw!
@wadib3eed75 жыл бұрын
So interesting information .
@JoeRobinsonTraining5 жыл бұрын
Thanks very much, stay tuned for more!
@hasansertkaya3808 Жыл бұрын
Thanks for the video, it has been absolutely amazing help! However, I have a question which I’ve been struggling to find an answer to. How do I find inductive reactance (XL) and inductance of a coil (L) if I am only given A.C voltage, Frequency and resistance. As I’ve learned from this video, all that is linked to one another and I need resistance of a D.C circuit as well to calculate the impedance so I can move forward with the question?? Any help would be very much appreciated!
@matthaddock64905 жыл бұрын
Great material Joe 👍🏻
@JoeRobinsonTraining5 жыл бұрын
Thanks Matt, really nice to run into you again today. 👍
@jacksonli67103 жыл бұрын
so helpful~~~~~~~~~~~~~~~~~~~~~~~~ thanks
@JoeRobinsonTraining3 жыл бұрын
You're welcome!
@markrowland53935 жыл бұрын
Excellent.
@JoeRobinsonTraining5 жыл бұрын
Thanks Mark!
@flyhighwithyourdreams.21324 жыл бұрын
hello joe. we have one 3 Ph Motor and that parameters are 22 kw, 40.9 A, 415 V, 50 Hz. How to find Apparent power, Power factor, Reactive power , Total impedance, resistance and inductive reactance Value. note : We measure resistance value 0.44 ohm (Ph-Ph), Inductance 7.2mH (ph-ph) Motor was Delta connection.
@JoeRobinsonTraining4 жыл бұрын
Great question, bit tricky to answer in the comments, may do this as a video. 👍
@Sergey30234 жыл бұрын
@@JoeRobinsonTraining will be waiting!
@sajicherian5392 жыл бұрын
Many thanks
@waynegram89072 жыл бұрын
The Inductance of the coil is at 142H but at 50hz, if you choose another frequency like 120hz or 1Khz the inductance of the coil will be different. So the same coil can have different inductance of the coil values based on the frequency?
@gbelectricks3 жыл бұрын
Hiya Joe, can you tell me the make and model of the calculator you use in your videos. I’m looking into buying a new one and this seems one of the best. I like the feature, that you can punch in an entire formula and basically let the calculator do the work! Thanks 🙏
@JoeRobinsonTraining3 жыл бұрын
Hiya, it's the Casio fx-85gt plus, but it's been discontinued now, the newer model is the fx-83gtx (no solar panel) or the fx-85gtx (solar panel). 👍
@jarrodreeves2329 Жыл бұрын
Hopefully someone can help me here, im a little confused. In the video Joe mentions the Impedance of the coil is Z = Vac / Iac? Thought the formula was z = square root of R (squared) + XL (Squared) ??
@craigcampbell76383 жыл бұрын
Thank you
@JoeRobinsonTraining3 жыл бұрын
My pleasure. 👍
@masoudmostajer3194 жыл бұрын
very helpful I want to design a snubber for inductive load can you help me?
@MrDangadave4 жыл бұрын
Ah Dang it, I got stuck when calculating the impedance, I didn't take into account the AC and DC current differences, need to swot up on that not to make the same mistake again. Cheers Joe.
@JoeRobinsonTraining4 жыл бұрын
Nice one for trying, I actually make a small mistake at the end of the follow up video to this one. It happens!
@wadib3eed74 жыл бұрын
I have a question , if the voltage source 240 AC and the current flowing through the inductor is about 4 Amp , the impedance will be 60 ohm , how to figure out the inductance of the coil and its resistance? The question, if i want to design an inductor for 240 AC and i want to know the inductance and its dc resistance but i supposed the current flowing is 4 Amp and the is impedance 60 ohm .
@JoeRobinsonTraining4 жыл бұрын
I think we'd need at least one more piece of information to answer that.
@wadib3eed74 жыл бұрын
@@JoeRobinsonTraining Suppose we have impedance 60 ohm , and we don't know inductance and resistance , i think if we need to design inductor let us suppose the power factor , as you know the inductor is not pure inductor PF=0.85 , cos(thita)=0.85 PF=R/Z R=0.85*60= 51 Ohm Z^2=R^2+X^2 Xl=31.61 ohm Xl=2*pi*F*L F=50 Hz L=0.1 H But i have another problem the electrical formula of inductance is L=m*(N^2)*(A)/l M= permeability N=number of turns A=coil area i=coil length but the equation has missing part , that part wire size to carry the current . i searched in google but there are more than one formula . any way , what about my assumption?
@frankrose46572 жыл бұрын
I'm confused to why you use the DC and the AC readings to figure out inductive reactants
@AndrewCook72 жыл бұрын
Jo Where does 2 pi f L Originate from
@edwind77613 жыл бұрын
If the coil is energized with DC you get its resistance, if you energize it with AC you get its impedance. With those values you can calculate XL, FP and the capacitor. It's clear and very smart but .. How can you get those values from a heavy-duty engine? Sometimes you don't have the nameplate. Is there any way to calculate them? Thanks for everything :)
@mohammadghobakhloo19863 жыл бұрын
Excuse me, Its very strange for inductance value. 1.42 H is veryyyyy large value. Is this true value?
@ahmedelmekawy65553 жыл бұрын
I need this playlist pls
@bartom3093 жыл бұрын
is 0.0424H 424mH ?
@koponstanley410 ай бұрын
(The multimeter looks nice)
@sergejpanov5543 Жыл бұрын
Mathematical inductor's value is 1.42H (big value) and the real measurement is..???