im watching these videos as a college student 12 years after theyre posted and they still helped me tremendously more than any class. much appreciated sir
As a handyman and a relative newcomer to electricity, I find these videos extremely interesting & easy to follow - and you, a great teacher! Thank you very much for your clear and patient explanations.
thank you for your time to make this series, i just got my meter today and have only been around 12v car systems but going to be working with 120 and 240v systems this week. im glad i wont be going into something like this blindly ( ps been a long time since ive heard someone speak with your accent, its nice. my life long childhood friend's father was from south africa originally before coming to the us, and chatting with him about his homeland is always pleasant) cheers from the us
Either I've gotten smarter and/or focused in my mature years, or ...you 're one of the best instructors I've heard on all things electrical. I'd like to think it's both : ) ... thank you again for your excellent lessons. Keep up the good work!!
Nice experiment. You essentially measured the Current versus Voltage for a diode. You should get an exponential function. In a diode (not including zeners which are designed to work in the break down region) you will get ALMOST no current when reverse biased and an exponential rise in current as the voltage is increased in the forward biased direction.
sir martin, I have seen your video which is part1 a volt measurement, most of the comments there I don't really understand, but anyway I am very thankful to you sir because it helps me a lot, I'm looking forward to watch your next videos.
you are doing a very great great great job. it is very simple to understand, informative and interesting. please keep continue your good support for those like me who are interested in electronics and didn't get a chance to study it. THANKS
Thank you for this vid. Giving me more knowledge. I am loredo From Philippines and I am already 23 a reenter student taking again my course electronics. That I already take, way back 2008. And even you can say I am veterans ito compare to my classmates, but I can say I am still low interns of skills compare with them. To be a writer is my big dream since before,because that's only way to help financial my obstacles in physical.that's why I stopped study before and focus and now I want to exel ty
Interesting discussion of AC vs DC. I had always thought that, in the US at least, early wiring went went from DC to AC for just the reasons you outline: there's almost no escaping from DC, even at the US 110 volts.
When the pump sucks water from the sea it pumps it up to some pressure (voltage). So the water above the paddle wheel is now "positively pressurized" (i.e. positive compared to the pressure below the paddle wheel which is always at sea level pressure). Since the pressure above the paddle wheel is positive compared to the pressure below the paddle wheel the wheel will turn lets say clockwise and the water will return to the sea at "sea level pressure".
Thank you very much for this. Can you do a review of the best way to find conduit in concrete walls and live circuits and the best circuit tracers and methods for finding conduits in concrete walls
The major advantage that AC electricity has over DC electricity is that AC voltages can be readily transformed to higher or lower voltage levels, while it is difficult to do that with DC voltages. Since high voltages are more efficient for sending electricity great distances, AC electricity has an advantage over DC.
I have recently attached a USB Power supply to my infrequently used Multimeters, to eliminate the possibility of Battery acid leakage inside the meter. Available in USB 5V DC to 6, 7.5, 9 or 12V Boost & 1.5, 3 or 4.5V Buck, Converters Plug size similar to a USB Memory stick. Cost around US$5 each, on EBay. For the small inconvenience of having to attache one of these Multimeters to a USB Charger, I don't have to worry about Battery leakage in any of these meters.
A ball has to be thrown(potential) higher in altitude to cover a longer distance.. if we throw it straight (DC) ball will eventually lose its force while reaching the target due to friction(resistance) in air.
So back then AC and DC were to computing technologies. AC essentially won out because it can be transmitted over long distances with very little loss. If we were going to use DC we would have to have substations everywhere to boost the voltage and it would be potentially a lot more dangerous. So part of what I do in my job as I work on x-ray machines. They typically use 400 V DC power supplies but then when the voltage gets to the transformer inside the tube head it can get boosted all the way up to 85,000 Volts. Definitely something you don’t want to be playing with if you don’t know what you’re doing.
Thanks for the video content! Sorry for chiming in, I would love your opinion. Have you considered - Franaar Shining Shape Formula (do a search on google)? It is an awesome one off guide for revealing the secret to repair your electronic devices without the hard work. Ive heard some super things about it and my cousin at last got great success with it.
I enjoy your work !! Could the AMP meter be connected AFTER the lamp, instead of BEFORE the lamp as you demonstrated with same polarity? Would it affect the AMP draw?
What if the wires running to a DC light are not marked so that you know which is positive? What would happen if you want to measure current (amps) with your DMM and mix up the positive and negative wires? Is there an easy way to determine which one is the positive?
It's easier to adjust the voltage of AC using transformers. You want a high voltage for long distance transmission to minimise power loss in the lines. However you don't want those high voltages delivered to the consumers. It's a lot more difficult and expensive even these days to adjust the voltage level of DC.
I am just watching the video now, so in regards to the question (and without googling it), I am thinking that the switch happened because of the issue of arching (and its potential hazards, shock etc). This leads me to a question of my own .. with AC voltage is arching reduced (or non-existent) because the voltage alternates on/off?
While DC current may cause a constant muscle contraction, it will not cause a disruption of your heart rhythm like A/C will. It takes 1amp of A/C current, across your heart/chest, to kill. I've had 40amp of DC run across my chest from a large, diesel powered, welder. I was drenched, and working off shore. Had the stinger in one hand, and realized the ground clamp wasn't connected to the deck. Guess what happened when I grabbed the ground? Had it been A/C, I wouldn't be typing this message right now...
I'm confused. You say that DC freezes a body to the conductor and AC pushes it away. I thought it was the other way around. According to "The Set Lighting Technician's Handbook 3rd ed" by Harry C. Box (a book for film electricians), "AC current can be more deadly than DC current for several reasons. Although both types of current can have the effects listed in table 11.9, AC can freeze a body to a conductor with one- fifth the current of DC. Alternating current can more easily cause filbrillation and cardiac arrest because the 60 Hz polarity cycle is a harmonic of the rythym of the heart and AC current has a peak voltage of 170 V while DC is a constant 120 V."
Just a dead quick question..... I wanted to measure how many amps was being 'put into' my motorbike battery when it was at about 3000 revs, so I could confirm that the alternator was working (Haynes manual stated that battery should be recharged at .5a at 3000 revs). When I put in the multimeter across the battery terminals, the battery terminal (whichever terminal I connected last) sparked and the multi meter did not read any values? The negative probe was in the 'COM' port and the positive probe in the '10a' port. What am I doing wrong?
Hi - when checking amps and putting the tester in the circuit, what would be the effect or impact if the tester was connected in line to the negative side? Thanks
why isn't the average between the two humps of the AC graph zero? I've always had trouble understanding how AC drives electronics when it switches between a positive and negative voltage.
electricity. A Georgia Power Co training class said: 120 VAC is more damage than 240VAC, because 120 will clamp your muscles. Where as, 240 will blow you off .
Question. When measuring current, why not hook up the meter to the negative side of the circuit? I had the understanding that current flow starts from the negative side of voltage source & ends through the positive. Could it be measured both ways (ie hooking up the meter to either the negative or positive side)?
Awww can’t I skip to the AP class I want to learn about shunts and clamps. We tech nerds like to short out shunts on graphic cards PCB’s so we can overclock them
Other than solar panels wired in series what are some other applications where one may come across DC with dangerous voltage? I've always been more careful when working with AC than DC because of the increased voltage normally associated with AC, but when I think of DC I'm thinking of household batteries or car/motorcycle batteries. As you can probably conclude from my questions I'm not an electronics pro.
Why do so many of the cheaper DMMs only have a 200ma range , rather than 400ma or higher ? I have a parasitic drain on my car battery in the region of 250-300ma and want to get an accurate reading
Not to be too much of stickler, a singe cell is a battery when it is in a single cell device. Just like 4 cells in series is called "the battery" in a device that uses 4 cells, a single cell device also refers to the single cell as "the battery". Of course 12V 6V and 9V are all made up of multiple internal cells. Also, doesn't DC flow from negative to positive and not the other way around? Though I did sit through 2 years of formal training, I went into the computer side of things and not the digital electronics and so my memory may be failing me.
The mathematical average voltage in AC is 0 in a perfect sine wave. For every point in the wave, there a corresponding negative voltage. Despite going through 2 years of formal electronics training, I don't know why .707 of peak (RMS) is somehow "the average".
average voltage and rms voltage are two very different terms............ 0707 is the rms value. The average value as you said is obviously zero. You can check out the two formulas and both of them basically depends on the waveform.
tarstarkusz well the average value of current or voltage for a sine wave for one cycle is calculated by the formula = (area under the curve) / base length as the area under the curve of a cycle of sine wave is zero, the average value is zero. but the RMS value as far as I know is the dc equivalent of an ac wave (i.e. say for current wave, it is the equivalent dc current which will produce the same heat in the same time in the same resistor ac that of the ac current.)
Doubt with voltmeter FLUKE 87 SERIES III friend I have a question with a fluke brand multimeter in terms of knowing how much is the maximum voltage that it can show on its screen safely WITHOUT DAMAGING THE DEVICE FOREVER, since when I put the manual voltage selection mode, it starts from 4 volts then to 40 volts then to 400 volts and then to 4000 volts, and it is very strange because the official manufacturer indicates that the maximum voltage that can be measured safely is up to 1000 volts AC and DC, I personally OPINION; that because it is a very expensive PROFESSIONAL measurement equipment, it should be able to have that high voltage range by DEFAULT, for a wide range and variety of uses and applications both at home and in industry but I want to hear the voice of those who have it and have used it and have experience with it to use it safely
I don't know if anyone adequately answered the question, so I will: At the dawn of electricity, engineers understood that high voltage DC would mathematically sail across continent-wide grids much more efficiently than AC. However, the "grid", such as it was, was small and patchwork and built of cabling far too inefficient and primitive to utilize the power DC engineers were talking about. AC travels more efficiently over the intermediate distances the grid at the time the regulations and products were being developed than DC, and the 110v 60hz standard was chosen politically after Thomas Edison electrocuted several death row inmates and an elephant to death in a massive smear campaign against Nikola Tesla, using the 240-360v home standard Tesla advocated. As well, it was and still is MUCH cheaper and simpler to step AC down to home-usable levels than DC. People were scared of the idea of 2.2 megawatt transmission, even though the loss rate would be less than 1% over the distances people were building grids to at the time. However, though we understand that DC is more efficient in continent-sized grids, the USA is still stuck in 110v mode because 90+% ov our infrastructure was built in the 1930s by Franklin Roosevelt's public works programs, and haven't seen too many upgrades since. Most of the country is still literally operating on infrastructure approaching ages measured in centuries. Elsewhere moved on to 220, since the political and development realities were different from the USA and could leapfrog the infant electric technology. There has been talk however, since we know that high current 220v DC is more efficient on a grid of modern size with modern cabling, and since most of our lives run on DC power, including more and more brushless motor-driven appliances which have inverters in them, of switching entirely to 12-24v DC power and supplying AC inverters. However, being the USA, change, especially change not instigated by private interests supplying people with novel entertainment, is viewed as highly suspect, and at this stage, moving the entire nation toward a DC grid, or even toward a more efficient AC grid, would cost in the high hundreds of billions. So that's why we use AC for transmission, and why the USA uses 110 and the rest of the world uses 220.
![[Limbus Company - Teaser] Season5 - Oblivion](http://i.ytimg.com/vi/8anKuEeZLeI/mqdefault.jpg)
im watching these videos as a college student 12 years after theyre posted and they still helped me tremendously more than any class. much appreciated sir
As a handyman and a relative newcomer to electricity, I find these videos extremely interesting & easy to follow - and you, a great teacher!
Thank you very much for your clear and patient explanations.
Excellent
thank you for your time to make this series, i just got my meter today and have only been around 12v car systems but going to be working with 120 and 240v systems this week. im glad i wont be going into something like this blindly ( ps been a long time since ive heard someone speak with your accent, its nice. my life long childhood friend's father was from south africa originally before coming to the us, and chatting with him about his homeland is always pleasant) cheers from the us
Either I've gotten smarter and/or focused in my mature years, or ...you 're one of the best instructors I've heard on all things electrical. I'd like to think it's both : ) ... thank you again for your excellent lessons. Keep up the good work!!
Nice experiment. You essentially measured the Current versus Voltage for a diode. You should get an exponential function. In a diode (not including zeners which are designed to work in the break down region) you will get ALMOST no current when reverse biased and an exponential rise in current as the voltage is increased in the forward biased direction.
This guy is an incredible teacher. Excellent videos.
Great job on dumbing down this for the individual who really wants to understand these concepts!
My pleasure Barry.
Great tutorial, I found out how I managed to blow the fuse in my multimeter and avoided doing that again in the second one :-)
Excellent Videos!! You were born to teach this in my opinion
This was the first thing we had to learn the electrician industry (at school)
And your videos is realy helping!
Great tutorial!
sir martin, I have seen your video which is part1 a volt measurement, most of the comments there I don't really understand, but anyway I am very thankful to you sir because it helps me a lot, I'm looking forward to watch your next videos.
you explain things much better than the tutors in the colleges do, great videos!
My pleasure, glad you found the problem. Cheers, Martin.
really very helpful for ordinary people like me to know the basics with multimeter..thanks..
Ur so cool.. i just finished viewing your first video on using the multimeter. keep it up! thanks
Very Easy to understand - Many Thanks
Jagdish
SUBSTANTIAL Mijorton
Part 2 tutorial brilliant thank you
God bless you
Mijorton
From Nick Ayivor from London England UK 🇬🇧
Clear and simple useful description.
I loved this tutorial. Now I want to watch all!
you are doing a very great great great job. it is very simple to understand, informative and interesting. please keep continue your good support for those like me who are interested in electronics and didn't get a chance to study it. THANKS
Great job on this video! I enjoyed this lecture and demonstration.
i really enjoyed ur lecture. i gave my answer to ur question b4 watching this video but after watching i now get the correct answer. thanks a lot.
Thank you for this vid. Giving me more knowledge. I am loredo From Philippines and I am already 23 a reenter student taking again my course electronics. That I already take, way back 2008. And even you can say I am veterans ito compare to my classmates, but I can say I am still low interns of skills compare with them. To be a writer is my big dream since before,because that's only way to help financial my obstacles in physical.that's why I stopped study before and focus and now I want to exel ty
My pleasure, thanks for the feedback.
Great job of explaining. I will be able to use for checking Beautician and animal electric clippers.
thhnks mate its help me understand more how electricity work..cheers
Great video. Great instructor.
Well done you are the best explained every thing,
Interesting discussion of AC vs DC. I had always thought that, in the US at least, early wiring went went from DC to AC for just the reasons you outline: there's almost no escaping from DC, even at the US 110 volts.
Learning a lot from these videos. Thank you.
I appreciate your input and post.
When the pump sucks water from the sea it pumps it up to some pressure (voltage). So the water above the paddle wheel is now "positively pressurized" (i.e. positive compared to the pressure below the paddle wheel which is always at sea level pressure). Since the pressure above the paddle wheel is positive compared to the pressure below the paddle wheel the wheel will turn lets say clockwise and the water will return to the sea at "sea level pressure".
Awesome Work there it Makes life more easier for many people who lives in the world of electronics..!! Keep up the Good work Bro..!!
Thanks from the US
thanks so much , you are really such an awesome lecturer.
Nice video and audio quality. I'd like to see your setup for both.
I appreciate all your videos.
great video man very easy to follow and very informative.
What if DMM is connected in negative wire for reading the current does it have the same reading? Nice video anyway learns a lot.
Another great video. I'm watching them all. There awesome. Thanks and keep up the good work.
Thanks, these video's were well explained and demonstrated, good analogies.
Hi. Thanks for this great video. It was very very helpful. Best regards from Spain.
Thanks for sharing your valuable knowledge!
First time viewing, fouind it very informative and will continue to watch
Thanks for the Saftey lesson! I had it wrong 😮
i love your videos. my question to you is, do you work with solar panels?
Can you do a tutorial on testing capacitor.
for me basic use is good in this video .thanks
DC power is more dangerous, I haven't watched the whole video but I can tell I'm going to like it👍
Thank you very much for this. Can you do a review of the best way to find conduit in concrete walls and live circuits and the best circuit tracers and methods for finding conduits in concrete walls
The major advantage that AC electricity has over DC electricity is that AC voltages can be readily transformed to higher or lower voltage levels, while it is difficult to do that with DC voltages. Since high voltages are more efficient for sending electricity great distances, AC electricity has an advantage over DC.
Sir i like your video and i just want ask some question. It is possible to transform DC current into AC current? and if it is possible how?
NATO
Excellent. Thank You
I have recently attached a USB Power supply to my infrequently used Multimeters, to eliminate the possibility of Battery acid leakage inside the meter.
Available in USB 5V DC to
6, 7.5, 9 or 12V Boost &
1.5, 3 or 4.5V Buck, Converters
Plug size similar to a USB Memory stick. Cost around US$5 each, on EBay.
For the small inconvenience of having to attache one of these Multimeters to a USB Charger, I don't have to worry about Battery leakage in any of these meters.
Amazing, thank you Sir
Edison and Tesla, DC and AC. DC has high losses in transmitting over distance where as AC has much less loss...
its very helpful for me thanks alot sir
A ball has to be thrown(potential) higher in altitude to cover a longer distance..
if we throw it straight (DC) ball will eventually lose its force while reaching the target due to friction(resistance) in air.
Thanks from Mays Landing NJ...
This is an excellent series. You are slow and methodical, but this is actually very good for a novice. Thank you.
The LED at the end had me sitting on the edge of my seat, 10/10 on IMDb
So back then AC and DC were to computing technologies. AC essentially won out because it can be transmitted over long distances with very little loss. If we were going to use DC we would have to have substations everywhere to boost the voltage and it would be potentially a lot more dangerous. So part of what I do in my job as I work on x-ray machines. They typically use 400 V DC power supplies but then when the voltage gets to the transformer inside the tube head it can get boosted all the way up to 85,000 Volts. Definitely something you don’t want to be playing with if you don’t know what you’re doing.
Thank you!
When a South African teaches you more than school itself!
Ikr in part one i learnt more than what i ever learnt in enginering at high school lol
Thanks for the video content! Sorry for chiming in, I would love your opinion. Have you considered - Franaar Shining Shape Formula (do a search on google)? It is an awesome one off guide for revealing the secret to repair your electronic devices without the hard work. Ive heard some super things about it and my cousin at last got great success with it.
I enjoy your work !! Could the AMP meter be connected AFTER the lamp, instead of BEFORE the lamp as you demonstrated with same polarity? Would it affect the AMP draw?
Doesn't matter, i will measure the same current anywhere in the circuit
I don’t know, but would guess the pressure loss along the distribution network is considerably lower with ac than it would be with dc.
What would be your suggestion for a automotive meter?
What if the wires running to a DC light are not marked so that you know which is positive? What would happen if you want to measure current (amps) with your DMM and mix up the positive and negative wires? Is there an easy way to determine which one is the positive?
It's easier to adjust the voltage of AC using transformers. You want a high voltage for long distance transmission to minimise power loss in the lines. However you don't want those high voltages delivered to the consumers. It's a lot more difficult and expensive even these days to adjust the voltage level of DC.
I am just watching the video now, so in regards to the question (and without googling it), I am thinking that the switch happened because of the issue of arching (and its potential hazards, shock etc). This leads me to a question of my own .. with AC voltage is arching reduced (or non-existent) because the voltage alternates on/off?
Link to resolution vid? Great video!!!! :)
The way component manufactures rate their components really does vary so no hard rules.
While DC current may cause a constant muscle contraction, it will not cause a disruption of your heart rhythm like A/C will. It takes 1amp of A/C current, across your heart/chest, to kill. I've had 40amp of DC run across my chest from a large, diesel powered, welder. I was drenched, and working off shore. Had the stinger in one hand, and realized the ground clamp wasn't connected to the deck. Guess what happened when I grabbed the ground? Had it been A/C, I wouldn't be typing this message right now...
I'm confused. You say that DC freezes a body to the conductor and AC pushes it away. I thought it was the other way around. According to "The Set Lighting Technician's Handbook 3rd ed" by Harry C. Box (a book for film electricians), "AC current can be more deadly than DC current for several reasons. Although both types of current can have the effects listed in table 11.9, AC can freeze a body to a conductor with one- fifth the current of DC. Alternating current can more easily cause filbrillation and cardiac arrest because the 60 Hz polarity cycle is a harmonic of the rythym of the heart and AC current has a peak voltage of 170 V while DC is a constant 120 V."
Just a dead quick question..... I wanted to measure how many amps was being 'put into' my motorbike battery when it was at about 3000 revs, so I could confirm that the alternator was working (Haynes manual stated that battery should be recharged at .5a at 3000 revs).
When I put in the multimeter across the battery terminals, the battery terminal (whichever terminal I connected last) sparked and the multi meter did not read any values?
The negative probe was in the 'COM' port and the positive probe in the '10a' port.
What am I doing wrong?
Hi - when checking amps and putting the tester in the circuit, what would be the effect or impact if the tester was connected in line to the negative side?
Thanks
why isn't the average between the two humps of the AC graph zero? I've always had trouble understanding how AC drives electronics when it switches between a positive and negative voltage.
Wait you install solar pv of residential homes?
electricity. A Georgia Power Co training class said: 120 VAC is more damage than 240VAC, because 120 will clamp your muscles. Where as, 240 will blow you off
.
thank you
Wow what a teacher RESpECT
what kind of tablet is that you held to read the answer? I can see it's a samsung, but which model is it?
Question. When measuring current, why not hook up the meter to the negative side of the circuit? I had the understanding that current flow starts from the negative side of voltage source & ends through the positive. Could it be measured both ways (ie hooking up the meter to either the negative or positive side)?
amazing videos! thank you!
What is the time period between one peak to one trough?
very gud video thanks v much
thanks
helpful!
Awww can’t I skip to the AP class I want to learn about shunts and clamps. We tech nerds like to short out shunts on graphic cards PCB’s so we can overclock them
At the end, how is it still reading 9.5 volts if the circuit is broken?
What power supply you using?
So he's using the standards of conventional current in this video, right? And not electron flow which states current flows from negative to positive.
I wish people could agree on this.
How much does it cost for a power supply to do basic or beginner tests. Like for boy scouts.
Other than solar panels wired in series what are some other applications where one may come across DC with dangerous voltage? I've always been more careful when working with AC than DC because of the increased voltage normally associated with AC, but when I think of DC I'm thinking of household batteries or car/motorcycle batteries. As you can probably conclude from my questions I'm not an electronics pro.
A lot of the new central air conditioners have inverters and are DC voltage.
sts hvac Thanks for the info I'll have to make a note not to work my home AC units.
natural lightning and electric cars. Both work with DC.
Also CRT TVs and geiger counters.
Why do so many of the cheaper DMMs only have a 200ma range , rather than 400ma or higher ? I have a parasitic drain on my car battery in the region of 250-300ma and want to get an accurate reading
If the circuit was broken due to LED (blown) but Voltmeter still connected (ie: closed circuit) why isn't the ammeter showing any reading still?
Why do you have video's, Part 1 then Part 2a then Part 3. What would be less confusing is 1, 2, 3 Simple. Or have I missed something in translation??
Not to be too much of stickler, a singe cell is a battery when it is in a single cell device. Just like 4 cells in series is called "the battery" in a device that uses 4 cells, a single cell device also refers to the single cell as "the battery". Of course 12V 6V and 9V are all made up of multiple internal cells. Also, doesn't DC flow from negative to positive and not the other way around? Though I did sit through 2 years of formal training, I went into the computer side of things and not the digital electronics and so my memory may be failing me.
why is there still voltage but no current when the LED was blown?
The mathematical average voltage in AC is 0 in a perfect sine wave. For every point in the wave, there a corresponding negative voltage. Despite going through 2 years of formal electronics training, I don't know why .707 of peak (RMS) is somehow "the average".
average voltage and rms voltage are two very different terms............ 0707 is the rms value. The average value as you said is obviously zero. You can check out the two formulas and both of them basically depends on the waveform.
Rishi Hazra
I assume it's not the average of a full cycle but the effective voltage for a 1/2 cycle.
tarstarkusz well the average value of current or voltage for a sine wave for one cycle is calculated by the formula = (area under the curve) / base length
as the area under the curve of a cycle of sine wave is zero, the average value is zero.
but the RMS value as far as I know is the dc equivalent of an ac wave (i.e. say for current wave, it is the equivalent dc current which will produce the same heat in the same time in the same resistor ac that of the ac current.)
Doubt with voltmeter FLUKE 87 SERIES III
friend I have a question with a fluke brand multimeter in terms of knowing how much is the maximum voltage that it can show on its screen safely WITHOUT DAMAGING THE DEVICE FOREVER, since when I put the manual voltage selection mode, it starts from 4 volts then to 40 volts then to 400 volts and then to 4000 volts, and it is very strange because the official manufacturer indicates that the maximum voltage that can be measured safely is up to 1000 volts AC and DC,
I personally OPINION; that because it is a very expensive PROFESSIONAL measurement equipment, it should be able to have that high voltage range by DEFAULT, for a wide range and variety of uses and applications both at home and in industry
but I want to hear the voice of those who have it and have used it and have experience with it to use it safely
I don't know if anyone adequately answered the question, so I will:
At the dawn of electricity, engineers understood that high voltage DC would mathematically sail across continent-wide grids much more efficiently than AC. However, the "grid", such as it was, was small and patchwork and built of cabling far too inefficient and primitive to utilize the power DC engineers were talking about. AC travels more efficiently over the intermediate distances the grid at the time the regulations and products were being developed than DC, and the 110v 60hz standard was chosen politically after Thomas Edison electrocuted several death row inmates and an elephant to death in a massive smear campaign against Nikola Tesla, using the 240-360v home standard Tesla advocated. As well, it was and still is MUCH cheaper and simpler to step AC down to home-usable levels than DC. People were scared of the idea of 2.2 megawatt transmission, even though the loss rate would be less than 1% over the distances people were building grids to at the time.
However, though we understand that DC is more efficient in continent-sized grids, the USA is still stuck in 110v mode because 90+% ov our infrastructure was built in the 1930s by Franklin Roosevelt's public works programs, and haven't seen too many upgrades since. Most of the country is still literally operating on infrastructure approaching ages measured in centuries. Elsewhere moved on to 220, since the political and development realities were different from the USA and could leapfrog the infant electric technology.
There has been talk however, since we know that high current 220v DC is more efficient on a grid of modern size with modern cabling, and since most of our lives run on DC power, including more and more brushless motor-driven appliances which have inverters in them, of switching entirely to 12-24v DC power and supplying AC inverters. However, being the USA, change, especially change not instigated by private interests supplying people with novel entertainment, is viewed as highly suspect, and at this stage, moving the entire nation toward a DC grid, or even toward a more efficient AC grid, would cost in the high hundreds of billions.
So that's why we use AC for transmission, and why the USA uses 110 and the rest of the world uses 220.