Understanding AC AND DC

[davidnyami]

thanks for the video

[TheGlitchBot]

4:43 whale noises ;) LOL

Great video though, really helped me understand.

[quackerjacks61]

Great video...when you used your voice, I thought chewbacca had stopped by xD

[wcoy79]

great video!!



[mummylambs]

I watched your video almost a year ago, and didn't fully get it. Now, for some reason it makes perfect sense. Thanks.

[GrantsPassTVRepairs]

@mummylambs Glad to hear it made sense the second time around. It took me a while to understand it as well.

[thebrizzell]

that 1st demo ahhhhhhhhhhh man - eys open dude. I had to pause and say something right a way

[hensoneric]

more noises please.

[joniindo78]

Great example and explanation

[pr1me4x419]

great video. you've made it easier to understand with the visuals

[Films4You]

A.C>

Please explain how come this happens in miain power supplies?

Live Wire------- = Positive

Nuteral wire--- = Negative

then

Live Wire------- = Negative

Nuteral wire--- = Positive

and so on at 60hz in the US and 50Hz in the UK

[GrantsPassTVRepairs]

@Films4You I don't understand your question. 

[Films4You]

@GrantsPassTVRepairs At least in the UK.

We have 250Vollts, 50Hz AC but with plugs are one wire is brown=live one the other is blue= nutural. (and one earth, 3 pin plug)

If the voltage swaps, AC, then why is one wire alwaye classed as Live, it must Alternate to negative and back to positive the other?

Thanking You :)

[GrantsPassTVRepairs]

@Films4You I think I understand your question. Here in the US we have 120 volts AC from our power outlets.. If you attached one of your meter probes to a ground rod and measured the Two wires going to your power outlet only one would have power in relation to the ground rod which is an earth ground. It's true that both sides have AC going through them but the term live designates that one side is live or hot in relation to the earth ground. I hope I made this is clear enough.

Dave

[Films4You]

@GrantsPassTVRepairs Yes.. this is my issue, the thing I find difficult to understand.

I guess it's the terms used. Hot=Live wire which can be Negative or Positive.

Neutral wire can also be Negative or Positive, in relation to the Hot wire.

I think for me it would be halpfull to see this on an oscilloscope, I am more visual, also showing Earth and every combination possilbe.

Thanking You 2000%

[GrantsPassTVRepairs]

@GrantsPassTVRepairs Here is one more point that may help you understand the term "live wire". With DC power we always think in terms of negative and positive, but with AC power it might seem confusing to grasp how one particular wire could be called the "live wire" when both wires continually change in polarity. Just remember one of the wires on your power outlet is attached to earth ground and one isn't. The term "LIve" doesn't mean it's positive, but in reference to earth ground it has power

[Films4You]

@GrantsPassTVRepairs Thank You x 1000 for this.

[GrantsPassTVRepairs]

@Films4You Your welcome.

[GrantsPassTVRepairs]

@Films4You When your talking about AC power from the electric company a live wire is still AC meaning it is both positive and negative in reference to the other wires. The term "live wire" with consumer AC power is meant to signify any wire other than the one attached to your earth ground.

[jericfos]

You explain the things in this video better than any person or book ever has, thanks.

[goktug123123]

will it can electrocute me if i switch the polarity of battery 60 times in a sec?

[GrantsPassTVRepairs]

@goktug123123 If the voltage and current are high enough it most certainly can electrocute you.

[uncleallo]

I have great respect for you and your knowledge on electricity. Where did you learn about electricity. This is a fascinating science that I wish to learn inside out. I just have some questions.

Did you just create low voltage electricity simply with a coil and magnet?

Why must the generator be in a coil? Is it so electrons can gain momentum from a stationary spinning magnet.

I think you should make videos about all of your knowledge in electronics.

[jabellae1]

great.!!

[Bahrawy100]

How is ac current generated in the coil when you spin the magnet?

[GrantsPassTVRepairs]

@Bahrawy100 I guess conventional theory would say electrons are moved through wire in the same manner as water through a hose. In the case of the magnet and the coil the magnet is able to move the electrons.

[slownightsolongg]

@Bahrawy100 Faraday's law

[ooglebydoogleby]

I love the experiment. I have a radio shack book from yesteryear as well as some more technical books i'm delving into and the oscillation of the sine wave i understood from the book but the attaching of the diode filtering out the negative cycle of the wave was instantly understandable with your demonstration and so in turn the bridge rectifier made perfect sense as well. Thanks a bunch. I sub.

[joblessalex]

Gave me a ton of understanding! How would I be able to turn dc into ac?

[xXDominoXx]

WOW THANK YOU!

[AtoZContents]

Thank you soo much!! I did not understand AC current till the very end though when you got to the Diodes. So does that mean that everything you plug into walls have diodes? Btw I am subscribing x)

[GrantsPassTVRepairs]

@AtoZContents Yes most electronic devices which plug in the wall use diodes to turn AC to DC. A majority of the devices which don't use diodes with few exceptions are AC motors, electric heaters, hot plates, hot water heaters, most heat generating devices and incandescent light bulbs. If you put a diode in series with an incandescent light bulb it will reduce its brightness because it will only gets half a cycle of AC.

[GrantsPassTVRepairs]

@AtoZContents I forgot to mention transformers also operate on AC input power or pulsed DC but continuous unbroken DC current will not pass through a transformer.

[jacobi2393]

thanks this helped!

[MrJustbecuase]

@GrantsPassTVRepairs the ammeter

[stephenbarron725]

great explanation the volt meters live a black and white tv and the osilascope a hd tv

[MrJustbecuase]

@GrantsPassTVRepairs the micro ampmeter

[MrJustbecuase]

wat kind of meter is that

[GrantsPassTVRepairs]

@MrJustbecuase The meter you saw is a micro amp meter. In this case its normal position is in the center scale.

[Sonicku]

what makes the electricity in a Battery come out at the Positive side? what keeps it from coming out the negative side? this is the part i dont get i always though Electricity went from point "A" to point "B" and it died, or unlessed it was looped (A-to-B) it would circulate for awhile until the electricity got weak and died out, i mean if the direction of the Current was reversed all of a sudden, wouldnt the electric device just turn off?

or mabey i got the whole electric idea wrong?

[GrantsPassTVRepairs]

@Sonicku I can only give you the simple answer someone taught me. One substance used in the making of a battery has extra electrons and one side has a deficiency. The electrons move towards the deficiency side.

[attpureownpk]

great way on both explanation for oscelloscope

[deceit1991]

GReat !excellent video !

[alitou001]

great video

[thymol210]

Thank you, it is fantasic

[246246]

Can you recommend any books that explains induction on magnet and coils that are easy on the brain, so it won't explode like the diode in the other video. I want to understand electromagnetism from an easy to learn book. I can't understand flux.

[secksie28]

good vid, but why would use ac as opposed to dc...or vice versa? whats the pros and cons?

thanks

[GrantsPassTVRepairs]

@secksie28

The main advantage of using AC over DC is because AC is easier to transport over long distances and redistribute to a lower voltage for consumer use with step down transformers. Unfortunately AC has more line loss over distance than DC, but AC is so easy to down convert. DC has less line loss over distance but due to the complexities of down converting DC we use AC. If you want to better understand AC line loss over DC look up Inductive and capacitive Reactance and corona loss.

[comelon3]

great..! thanks

[mosfet101]

That's an excellent demo.