Supplemental technical education more effective, convenient, and engaging than your expensive textbook and boring instructor. Features online lectures and illustrated example problems for basic electrical circuit analysis (DC, single phase AC, 3 phase AC), hydraulics and pneumatics, motors and generators, motor control, programmable logic controllers (PLCs), motor drives, renewable energy applications, and more!
I told everyone I know about you and your Material. You are the best teacher I had. I'm a Mechanicall Engineer in Argentina and I KNOW YOU ARE THE BEST !. Hands down !. Luckyly , this hard lectures ARE SHORT ! :). Nice !. Thanks again !!!!!!!!!.
Hi Jim, I found all of this to be most useful. Let's just say it's been a few years since I left school, and I'm hoping to start a new career as a wind farm tech in the next month (I previously worked as a telecommunications tower rigger). The information and tests were made easy by your teaching. Thank you good sir.
15:32 Here you finally reveal that the needle is allowed to move very slowly when you close the contactor... Whereas throughout the lecture you're implying all the time that there's only one right moment, and that's when the match is perfect. So... You're actually quite confusing and failing to explain the crux of the synchronization process. I.e. _why_ a small speed difference is practicable and how.
not only would I waste time reading circuit analysis but by and large I have learned that listening to other RU-vid channels is mostly a waste. Thanks Jim!!!!
And you just made my day again !!!!!!. With your jokes ( woody wood pecker, and the medical coverage , you have got me ! ) and everithing, you catch the attention of everyone in your lectures. You are awesome !. Love to have you here and look to meet you some day !. Thanks. Pablo.
Hello Jim. Can't wait to thank you all the knowledge you share here. I can't just thank you enough for teaching me and us all what you know and have learned all over the years. You explain to me things that I just wondered around for 25 plus years and you made everything so clear. You are Awesome. Thanks. Pablo.
Weird right? Yes, 2 pole pair motors have 2 magnets on the rotors. 3 pole pair motors have 3. Etc. etc. Although motors with more pole pairs go slower they're stronger (ie: more torque) than a similarly rated motor with less pole pairs. More magnets means more stopping points along the way but more strength.
HELLO jIM. HERE WE ARE AGAIN. YOU ARE MY BEST TEACHER OF ALL !!!!!!. YOU MAKE MAGIC TURN TO UNDERSTANDING AND KNOWLEDGE. YOUR LESSONS ARE SO CLEAR, THAT I'M HAPPY TO BE AROUND AGAIN. THANKS AND TAKE CARE. REGARDS . PABLO.
I have a doubt when we subtract A - B , should we take into consideration the values of the operation and draw the resultant vector from the origin? Because i am not understand why we start from B and then go to A.
Common question. Here's an analogy. Think about the simple number line you used when your teacher first introduced subtraction when you were around 5-6 years old. Consider the expression 5-2. 5 is A. 2 is B. Draw a line from 2 to 5 (ie: B to A). 5 is 3 greater than 2.
I definitely have some sort of incorrect assumption somewhere any help is appreciated. I am totally fine with the idea of high side switching being safer given conventional current and all but I am still confused as to why that is because I remember that in reality it is the electron that carries the energy and is flowing out of the negative terminal. The electrons coming out of the negative terminal have a higher energy potential and disipate it through an element. So in reality the (+) end has the low energy electrons and should have a voltage of 0 in relation to the ground no?
What up? Hey if you’re in town this weekend swing by the campus Saturday for the STEM fair 9-12. You’ll be jealous of all the cool new equipment we have now!
@bigbadtech Would love to! But I live in Phoenix now. Finished a MS in EE at ASU and I work in Tesla's battery dept (Megapacks Utility scale). All these levels of education and CGCC still boasts the most technically adept teacher I've had.
If this is a single phase transformer serving multiple houses, does the center tap get bonded to the grid neutral? (The one that runs along high voltage lines)
Hey Man appreciate your work. Could you please help me understand what voltage is provided to rotor when nrotor=1800 and nstator=1800 (time 13:16 ). If i understood corectly when nelectromagnet is 0 rpm, voltage frequancy in rotor is also 0, which means that there is a Dc voltage or there is no voltage at all, second situation obviously does not make sense becouse there wouldnt be magnetic field, first situation is also not clear becouse how would you provide dc through AC/AC converter. I have also second question if i am right the current is provided to the rotor from the grid(but is it only during excitement or also during normal work?), if the rotor is provided with power from the grid whole time how is it possible that the power in wires is going in 2 opposite directions at the same time power going to the rotor and power going from the stator(is it possible becouse of 3 phase ac voltage?) or is it working like that: after generator is excited stator provide power to the grid and to the stator?
first question, 0 Hz = DC, the middle part of AC to AC converter is DC so it's just AC to DC second question, yes it's 3 phase AC sometimes it goes in some times it goes out
Hey Jim, for the final problem, if I am trying to calculate S2 using I^2 * Z, do I keep the absolute phase shift for current since we are dealing with impedance in the equation and not voltage?
Remember AC power is always calculated using "relative" phase shift. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nse2vSlOoME.htmlsi=70pdqlKKBlYBHfN0&t=2237 In this example current leads voltage by 52 degrees thus apparent power has an angle of -52 and can be resolved into + real and - reactive. An incorrect angle of -114 would have - real. Negative real power is an active source like a generator.
If it was easy to be an electro-mechanical technician you wouldn't earn the big money. Yes, the pin outs for an octal base are a little odd but once you get used to them it becomes more intuitive. There are control relays that make use of isolated single pole single throw switches (SPST) rather than octal base relays (which use 2 pairs of SPDT transfer contacts) but, probably because of historical inertia the octal bases are more frequently employed.
Thank you Jim for your videos. I really wish you would have gone into a little more depth on the explanation on real and reactive power supplied to the grid. I know you say you studied it so we dont have to, but im studying it too and find it difficult to understand the relationship between how real power and reactive power and how it is independent from eachother.
Here's the video that describes the difference between real and reactive power: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nse2vSlOoME.htmlsi=_LDG4_IXly2Kh_ux
