What is a Sine Wave - why it is an important electronic waveform

[@halftimedeus8871]

Great video! I've been starting to get into vibration testing equipment and I really need to get acquainted with the basic physics behind the software. Kinda hard to do, as I have little to know knowledge in physics, but you explain things really clearly. Keep up the great work!

[@ElectronicsNotes]

Glad we helped. Really pleased we were able to provide a useful explanation.

[@thisdudeisadude]

amazing video and thank you for making this

[@ElectronicsNotes]

Really glad you found this video useful. Thanks for your comment.

[@captainmorgan7849]

Great video! I have a question though . My professor asked me why we generate current as sinusoidal waves? I am still looking for answers but can't find anything he'll accept. If you can help me i would be educated and pretty happy.

[@ElectronicsNotes]

This is an interesting question. AC is used rather than DC because it can be transformed between different voltages. We see high voltage lines that carry many kilovolts, but our domestic supplies are much lower - typically 115V or 240V. High voltage power lines are used to distribute power because they have much lower losses than lower voltage ones - the resistance is the same regardless of the voltage. The resistive losses depend upon the current, so if the voltage is raised the same actual losses occur, but this is a much smaller portion of the overall power carried. DC cannot be transformed, it has to be AC because transformers do not work with DC. As for use of a sine wave, this is because it is only contains the fundamental frequency - all other waveforms contain harmonics. AC generators generate a sine wave. The other advantage is that square waves contain a high level of harmonics and these can more easily radiate and cause interference, etc. Also transformer efficient can be optimised for a single frequency rather than having to accommodate all the frequencies of a square or other form of waveform.

[@captainmorgan7849]

@@ElectronicsNotes I am going to mail this to my professor if he accept's i'll edit my comment. Thanks for the answer!

[@MegawattKS]

Another reason is how the power (voltage and current) is produced in generators. The spinning magnets naturally produce periodic increasing and decreasing flux through coils of wire in the generator. This creates sinewave voltages (and currents when hooked to a load). If generators are not familiar, think of electric motors. Generators are just rotating machines like motors, working in reverse (generating power rather than consuming it).

[@tara2112-p7z]

This is a great video. I'm working with Rife frequencies for healing and teaching myself about waveforms etc...Your video is easy to follow and understand considering how overwhelming this info can be for the not so mathematically inclined and Physics illiterate like myself. Thank you!

[@ElectronicsNotes]

I’m glad you found the video useful.

[@shashidharshettar3846]

Thank you for making me understood

[@ElectronicsNotes]

Happy to help

[@lasse3412]

Great video

[@ElectronicsNotes]

Really glad you like it.

[@naderhumood]

Thank you very much indeed Sir, great vedio.

[@ElectronicsNotes]

Glad you liked it

[@SoundAround-gr2xi]

"For square wave only the 'odd' harmonics are present". kzbin.info/www/bejne/bZncc5-VqbmKnpo Is it because they are in phase with fundamental at all '0' transition points? kzbin.info/www/bejne/bZncc5-VqbmKnpo

[@T0NYD1CK]

The comment about square waves is a bit of a simplification. Firstly, you cannot make a perfect square wave from a series of sine waves. You always are left with a "ringing" effect at the corners. It is known as the "Gibbs Phenomenon." The second point is that to contain just odd harmonics the square wave must have an equal mark-to-space ratio. That is, all the vertical lines must be equidistant. If instead we have a series of pulses which can be considered a square wave with a different mark-to-space ration then you get all the harmonics both even and odd.

[@ramaswamybandari8182]

Knowledge giving video

[@ElectronicsNotes]

Glad you found it useful.

[@Espectador666]

beautiful

[@ElectronicsNotes]

Glad you like the video.

[@catlvr-kg9ol]

Amazing thank you

[@ElectronicsNotes]

I’m really glad you appreciated the video. Thanks for the comment.

[@aliashour6685]

Thank you

[@ElectronicsNotes]

I’m glad the video was useful.

[@teh60]

Very interesting.

[@ElectronicsNotes]

I’m glad you found it interesting. Thanks for the comment.

[@culater]

Thanks !

[@ElectronicsNotes]

I’m really glad you found the video useful.

[@culater]

@@ElectronicsNotes Useful and fascinating. I scooped up some of your other videos too. I'll feast on them later. Info on sine waves was a nice review of long forgotten math. Want to learn Fourier transform.

[@ElectronicsNotes]

@@culater I’m really glad you find them useful. I’m trying to keep producing useful videos while trying to reduce the time spent in making them. A tricky balance.

[@culater]

@@ElectronicsNotes Yes, the effort shows in your work

[@LaymensLament]

Thanks for the video. What I'm currently trying to understand is why the sinewave doesnt produce harmonics or partials (besides during the attack phase) and all other waveforms do.

[@ElectronicsNotes]

A sine wave is the fundamental waveform and by definition a perfect sine wave does not have harmonics. Other repetitive waveforms can be built up using a series of sine waves.

[@T0NYD1CK]

Mathematically, a sine wave lasts for ever. It started at minus infinity and continues to plus infinity. So, if you switch it on at some point, what you have is not mathematically a pure sine wave. That accounts for starting transients. The really interesting thing about sine waves is that if you put them through a linear system then you always get out another sine wave with exactly the same frequency. The shape is exactly the same, only the amplitude and phase are changed. That makes them very useful to help document the characteristics of a system. You can feed in lots of different sine waves and see how the magnitude and phase of each one changes as it passes through the system. If you think about a square wave with a perfect 1:1 mark-to-space ratio and you put that into a system then each harmonic will be treated independently. If some frequencies are delayed more than others or if the amplitudes of the harmonics are treated differently then the shape of that square wave will be altered so what comes out will not look like a square wave.

[@jonathanquijano3174]

Is this javidx9

[@ElectronicsNotes]

Don’t think so because I don’t know what javidz9 is.

[@986-xf1jmには]

.....I have a brain virus......."he's" acting extra normal...?like there's nothing going on.......is everyone ready to go street camping.....? Balboa park again? Let's follow him and do some improv...while he's getting his balls girated standing there trying to act normal.......like nothing's going on......"he doesn't even have a stunt-double/ 3heads combine to one. Telling him where to go....."or how to act....

[@986-xf1jmには]

Or what where or what to say.vor what to read......or how to breathe......or how to blink.....

[@986-xf1jmには]

Or what where or what to say.vor what to read......or how to breathe......or how to blink..... Or where to shit or how to eat .

[@986-xf1jmには]

He's over there in apt .1 like nothings going on.... Does anyone Need anything.....anyone?, He hasn't learned how to teleport to your location yet. I'll trying that way we can figure out what you want.....he's going to be right there watching videos with jakoffset, his son.

[@986-xf1jmには]

in senario land......why do I need to hear this......? Like he doesn't even know any of you.......

[@986-xf1jmには]

Is this "group/gang" still making bets? Who's doing what?....wtf that's side told told side what to do, he said/she said/he did/she did .....and I get to hear extra waves.....time for Compton scattering.....

[@frutigermetroboomin]

Thank you

[@ElectronicsNotes]

I’m glad you found the video useful. Thanks for your comment.