You are a world treasure, with an accent. Could not find a better teacher. All useful knowledge, no useless b.s., no silly ego, no "posing for the girls", no smug self serving "Call me Mr.", no silly assed insane politics. You *sir* are a credit to all *real* teachers, you are what they should be, and used to be. You are why the world was at its peak.
Rich. Still learning though i am 65 been playing with eletronics for 50 years.and still surprised that i am gaining info. they do say that you are never to old to learn. well done mate. certain figures say in your head RMS 1.414 & .707 great Vids mate keep them going. all the best Steve
Thanks! I’ve been an electronics hobbyist for nearly 40 years and this is the first time I’ve seen an explanation of RMS that is really makes sense. And that peak AC voltage explains why rectified AC is such high voltage. I appreciate it!
Richard I’ve followed your repair videos for quite some time and purchased a lot of the equipment you have recommended and they are top notch. This course is excellent . I enjoy your method of teaching. The way you present and draw the topic is the best . Thank you for sharing. 👍 Cheers Mate
That hertz my brain. I wish I had you as an instructor in school. I would be an electrical engineer (yeah right) instead of a glorious paper pusher. Thank you for your edification.
Very good Rich, only thing to add was that although A/C is used for higher power transmission when the voltages get very high and the distances significant then the go back to DC (well HVDC?) e.g. the links to France and Norway for grid power interconnection. Keep up the great work 😀👍
Good video Rich. One thing you haven't mentioned yet, is the frequency of the AC Sine wave as its shown in the time domain. I know that will come later but it will become very relevant later.
220v AC is 155.56v RMS and if you were to apply 155.56V DC (direct current) to a resistive load, it would produce the same amount of heat as if you applied 220V AC to the same resistive load. I think this is a better way to understand it. Your graph tells us we have 220v AC and the RMS value has to be lower not higher. You divided when you should have multiplied I think. Great series.....cheers.
The 220-240VAC value referred to, is the measured RMS value of the mains voltage in the UK, not the pk value or pk-pk value. 0.707 x Vpk = RMS so RMS / 0.707 = Vpk. Nothing wrong with what Richard did. 220VAC RMS / 0.707 = 311Vpk and 0.707 x 311Vpk = 220VAC RMS.
Love these videos i did basic electronics 30 years ago and can't remember a lot of what i learnt so im finding these very handy to brush up again.. Please could you do a video explaining how to work out resistor colour codes i was taught a rhyme to remember it but its been so long I've forgotten it.. Thanks again looking forward to lesson 4
@@andrewtucker6325 It's ready and scheduled for Saturday 9am UK time. I put it under the 'All You Need To Know' category as it ended up a bit of a broader topic than I originally thought.
It might be helpful to mention that the different ways of measuring AC voltage each have their own place and aren't meaningless. It depends on what problem or question you want to address. The RMS value is important when it's about power dissipation (as you mentioned). The peak voltage is relevant for safety (insulators, max. distances before it can arc over, that kind of thing). The average will tell you if the waveform has a DC offset. And so on.
Love your videos Rich very much. Just to be sure though, with reference to the generator theory at time 7:00, the greatest rate of change of voltage, ie: the maximum slope of the Volt-Time graph (when voltage equals zero) occurs when the coil is at the 12 o'clock position. The greatest voltage occurs at zero slope on the graph when the coil is moving the fastest with reference to the magnetic field at the 3 o'clock position. Kind Regards.
Yeah it does. I was just trying to make a visual analogy to correspond with the graph of the sine wave. I hope that much of the explanation was good enough to give an understanding of the basic principle and why a sine wave is the shape it is
Rich , perhaps you should mention alternating dc too. (When the sine wave swings to its maximum in the negative direction but still has a positive voltage)
At 7:40 you explain that AC is generated by alternating voltage while DC is generated by a static or fixed voltage. However if you move the x-axis in your AC graph below the sine-wave's minimum so there is no zero-crossing then the polarity is fixed, current flow never changes direction yet you have a non-fixed/sinusoidal voltage level. So in this case do we have an AC or a DC signal?
Correct me if I'm wrong but isn't the mains voltage always stated in RMS??, as 220V RMS, and you get the peak voltage of that using RMS 220V * 1,414 = 311 volts peak. So how would it be possible to have a lower RMS when it already is the RMS you have in the mains voltage
Fantastic stuff, buddy. But I have to confess, I'm finding it so difficult to grasp HOW you can have a NEGATIVE, or below zero voltage.......I can understand a gigh voltage and a low voltage but how can it drop BELOW zero? Keep up the great work.
I build guitar fx pedals... the pedal circuit runs on DC, but the signal it receives from the guitar is AC. When I design a new circuit, i have to keep track of both the DC power rail, and the audio path. Sometimes, I design pedals with 2 power rails, where one part if the circuit runs at a different voltage than another part. It can get super confusing really quickly if I dont plan things out carefully before hand.
