Alternating current, direct current & what is frequency? | Physics | Khan Academy

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[@Humansince2004]

Current comes in two flavours ☺️☺️☺️☺️☺️ Edit : unexpected number of likes

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In particle physics there is actually 'flavours for particles'

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[@pinkflower88]

Answers: 1. DC - Direct current AC - Alternating current 2. If the frequency is 50 Hz it means that there are 50 cycles in a current per second. Also, it means that the current changes it's direction 100 times a second (a cycle consists of the change of direction twice) 3. Sending a large amount of voltage through long distances is uneconomical thus a better way to reduce the cost us to send much lower voltage through the same distance and then increase the voltage through a transformation when it reaches its required location. Now, since the transformer only works if the current is alternating, the current reaching our homes is AC. Feel free to correct my mistakes if any

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Excellent explanation. Understood really much of everything about it. Thank you.

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I got the answer which I was eagerly searching for!!!

[@dingalarm]

Excellent video. Clear explanation 🙂 I believe another reason why high voltage / low current A.C is used in power lines is for cost reasons, so that thinner electrical cables (i.e. less copper) can be used.

[@JatPhenshllem]

Yeah, cause less energy is lost. There isn't as large a need to reduce resistance

[@prashikvaidya1986]

Thanks a lot. No one was answering me about why AC? My doubta clear now...😍

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Thank you so much sir!! I was curious about this question : Why AC and not DC..??... But now I got it cleared sir... Thank you 👍🙏

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[@unbiasedopinionwala1563]

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[@Jo-mz2my]

Transformer can be either step-up or step down. Especially in India, Transformers that we find near our home is step down. It converts high voltage ( usually 11 KV or 1100 Volts ) to low (415 volts). From the transformer three phase lines and one neutral is supplied to electric lines posts. Form that , one phase line and neutral line gives us normal 230 volts .

[@faxedits8]

@Jo Hello In ac current goes backwards and then foreword When it goes backward or forward does it cover the whole circuit once Or from some distance it come forward again

[@Jo-mz2my]

@@faxedits8The charges may not cover the whole circuit when it goes forward or backward. When the charges flow from one point to another, they will continuously change their direction in a to and fro manner and reach the final destination .

[@SmallTalkNetwork]

Fascinating... I knew nothing about electricity and I thought transformer do the opposite of what you just shared. Now I know better

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I also try this with tubelight it's fun👌🏻

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Current comes in two flavors😍💅🏻

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Best video about intro in AC

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[@ABC869]

Sir , one question that troubles a lot of people , if current alternates why do we distinguish the 2 cables (for a single phase ) as hot wire and neutral . if it alternates then shouldn't for the first half cycle the brown wire (L) to be the hot one and blue wire (N) to be the neutral and for the second half cycle the brown wire to be the neutral one and blue wire to be the hot one ?

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Current come in 2 flavours 😁0:38

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[@webmaster8925]

If AC current “flows” in both directions, why is there a need to distinguish a live from a neutral wire?

[@valengammungvi1210]

The potential difference of the neutral is always kept very low(almost equal to zero).

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Tysm for the explanation.

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Im currently in semi conductors chapter and i have these questions haunting me🥲 ( like why to use use AC instead of DC )..thank you so muchh..it is helping in my preparation and making much more sense now😭😭💜

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[@iamthestrongest007]

Why the electrons flowing in A.C current moves back and forth, is it just to imagine or is it actually how it works? Well electrons bounce off of 1 atom to another, so does that mean it bounces and then bounces back to the same atom again? I can't understand why the electron are moving back and fourth in the A.C current.

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[@wa51m]

Sir in AC if current goes back and forth how will the destination be reached

[@omm12459]

Electrons go back and forth in the entire circuit...so the electrons also move inside the electrical components coz it's also a part of the circuit...i think so... I'm not sure...but i my teacher answered me that it's electrical energy which reaches the destination...

[@LearnInnovateAI]

@@omm12459 you're right

[@omm12459]

@@LearnInnovateAI i have written 2 things .... which one is right?🤔

[@LearnInnovateAI]

@@omm12459 both, it's the energy that's being transferred by making electrons swing back and forth

[@omm12459]

@@LearnInnovateAI oh... Thank you

[@adee_abcforshort]

but, this is w.r.t to incandescent bulbing. How about LEDs, would it still flicker (bcos of no heating element, not exactly)?

[@santoshkute4082]

very clear

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[@Mr.Xisdead]

Why can't we send low dc current and use the transformer to step up the current

[@karuppiahmani8125]

Sir, I have a doubt.... if one electron is moving through the bulb for many times back and forth, then it should have lost its energy . But it hasn't. The bulb still glows brightly, 🤔

[@challanarendra6674]

Sir I have dought on AC current ? Current means flow of elections or charger particles ,that means current is moving ,ln AC current the charge particles does not move it just oscillat in the same place then how the current flow

[@sabeehb9514]

Brilliant explanation, best video on this topic

[@dr.allwyndsouza5246]

Sir, if AC is the current driving behind tube lights and other devices, then why do fans rotate in one direction only, fans also receive AC, then fans should rotate in one direction and then in another direction, for a fan to rotate AC has to be converted in DC via rectifier, so my question is rectifier not used in powering tubelights ?

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