GCSE Physics - Alternating (AC) and Direct Current (DC) #21

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This video covers:
- The difference between alternating current and direct current
- Voltage-time graphs
- Oscilloscopes
General info:
- Suitable for all GCSE and IGCSE courses
- Suitable for higher and foundation tiers
- Suitable for triple and combined science
Exam board specific info:
AQA - Everything is relevant to your course!
IGCSE Edexcel - Everything is relevant to your course!
Edexcel - Everything is relevant to your course!
OCR 21st Century - Everything is relevant to your course!
OCR Gateway - Everything is relevant to your course!

Опубликовано:

21 сен 2019

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Комментарии : 96

@Cognitoedu 4 года назад

Hi everyone - we just wanted to clear up a bit of potential confusion about whether UK voltage is 230V or 240V. *Be aware that at the time of writing you can give either figure in your exam and you'll get the mark.* Many resources will cite the UK voltage as 230V, however this isn't technically true. Historically, UK homes have been supplied with 240V, and EU homes have been supplied with 220V. In 2003, they 'harmonised' the voltages across the UK and EU, and so both were now labelled as 230V. However the actual voltage didn't change, but instead the official voltage requirements for any electrical goods made in the UK/EU were altered - so that they would work using voltages ranging from ~215V to ~250V - and work in both the EU and UK with no problems. It's nothing to worry about either way, but we hope this clears up any misunderstandings :)

@stustjohn 3 года назад

Thank you for clarifying this. However, you still have dropped one major clanger in this presentation! When you labelled the values on the voltage-time graph you said/wrote from +240 V to minus 240 V. This is not right. (Nor is it plus to minus 230 V.) The peak voltage will be √2 x 240 (or whatever value your supply actually is). Look up RMS voltage to find out why. (A level topic 🤓) I usually avoid putting values on the y-axis for most classes, as it raises an issue that cannot be satisfactorily answered for the average person! (If a class insists on knowing then I warn them, and if they still want to know then I give a 2 minute summary of RMS values... 😁)

@caslonantique 2 года назад

Indeed. However, your video claims (at about 1'20") that the UK mains fluctuates between ±240V and this is definitely not the case; the 240V figure is the root mean squared (rms) value, and so the peak voltage is actually about ±325V.

@bxby.ros1e 7 месяцев назад

@@caslonantiquedoesnt matter bro. That aint getting us no marks icl

@11james. 7 месяцев назад

@@bxby.ros1e I swear

@lewisbrown9773 3 года назад

This dude is legit saving my GCSE's

@Cognitoedu 3 года назад

🙌

@BOB__M 2 года назад

Same

@adventurer_dallinio1857 Год назад

same! got grade 9

@aurora-of7sx Год назад

if you did them last year, are they like really hard because I have to do them next year

@adaml6793 Год назад

@@aurora-of7sx why you on here if your next year lmao

@user-uj7yc2vw5h 3 года назад

This guy teaches me better in two minutes than my physics teacher does in an hour

@teaminstinct3829 2 года назад

True

@toastar1232 Год назад

fax

@javariscrittentonslawyer8792 Год назад

Frfr

@guscrafts1756 Месяц назад

exactly

@michii9487 3 месяца назад

AC/DC MENTIONED 🗣🗣🔥🔥💯💯⚡️‼️ WTF IS A BAD SONG 🦅🦅🔥🎸‼️🗣🗣

@leeharuchiyo351 2 месяца назад

physics got me on the highway to hell fr 🙏😞

@dln.w Месяц назад

GETO PFP IM PHSDIBG MYSELF

@boo706 2 месяца назад

Cramming the whole playlist night before the exam ganggg‼️😭

@Kur4p1kachu Месяц назад

HOWD IT GO

@sobky6378 Месяц назад

Don’t call me out like that

@genshinstudios Месяц назад

stop calling me out my exam in 8hours💀

@Zach-qt8nz 2 года назад

omg you are the freaking best teacher I have ever had. Your explanations are so clear and easy to understand, same topic i spent hours on i understood in minutes. Am legit about to go into tears.

@Cognitoedu 2 года назад

Haha really glad we could help Zach 🙌

@doctorwilde7046 2 года назад

Yeah, all teachers are shit and all videos are awesome! May as well stay at home and watch RU-vid. All school is a waste of your precious time.

@justsomenightowl7220 5 месяцев назад

I just found this channel! Even though I’m in uni, studying more advanced subjects now, this is like the perfect revision material for all the little things i didn’t fully understand in high school! I’m so thankful. In 2 minutes a subject is perfectly clear and I understand it better than I ever have! Love your channel to death 🤍🤍🤍🤍🤍

@gunakusal8321 3 года назад

very helpful resources.....not only for GCSE but also IGSCE i would highly recommend candidates doing the cie examinations use this content....... thank you for giving us this free and reliable resources

@Hamster-wy7nq 2 года назад

I'm preparing for my IGCSE physics exam using these videos. You're right, they are helping me really a lot!

@ruiiios Год назад

im a cbse student lawl :')

@Saitmayt-xu9dp 6 месяцев назад

Yes 😂

@Saitmayt-xu9dp 6 месяцев назад

@@Hamster-wy7nq True

@talhaafzal180 Год назад

Amazing! I've gone through all the much worthy praise in the comments section but my only question is how can you be so flawless and to the point in 2 minutes? Kudos, indeed!

@Cognitoedu Год назад

🤩 Thank you very much Talha!

@kevinhanksable 2 года назад

Thank you very much. Brilliant.

@user-rs9bx4ou5k 5 месяцев назад

This channel saved my life several times 🙏

@vt.physics 4 года назад

Very useful video! My students always forget the difference between the two types of current!

@siyasingh6076 7 месяцев назад

I loveeee your channel too Your videos are awesome!! Keep it up, lots of love.

@universeusa 4 года назад

Awesome. Thanks!

@Cognitoedu 4 года назад

Cheers Jake! Glad it’s helping 🤙

@universeusa 4 года назад

Cognito , yes, it is. Thanks 🙏 again.

@zaaraiqbal7722 3 года назад

i just saw AC/DC and clicked 😐

@poissonerie6975 2 года назад

clickbait lol

@chandiofan3932 Год назад

U tweakin woman its literally what the vid is about

@somerandomfellow8321 10 месяцев назад

@@chandiofan3932where’s the rock music then?? You smelly nincompoop

@user-oi6vj3fc9i 3 месяца назад

I like your videos and your channel. I love it.😂😂😂

@demispov804 2 года назад

I am watching this an hour before my exams

@sayom8987 4 года назад

thunderstruck

@suhridshourjarahman9631 3 года назад

I see your a man of culture

@SarahhAzmy 4 года назад

Thanks!

@ops_rs2844 Год назад

hughes is a legend

@philipbrady7635 7 месяцев назад

extremely useful

@karenmudzana766 2 года назад

what about the gold lesf electroscope ?

@TonkerSC 2 года назад

Last gcse tommorow thank god

@yvonneg1006 4 года назад

Its 230V in the UK not 240

@Cognitoedu 4 года назад

Hi Yvonne, thanks for your comment - I've made a pinned comment addressing this. Good luck with all your work!

@princekaki5424 3 года назад

it was very helpful i understand the topic better now

@Cognitoedu 3 года назад

Thanks Prince, that's great to hear 👍

@lola100yearsago8 3 года назад

I don’t this is bullshit

@Bbqeee Год назад

Very useful thanls

@samimarahman1236 2 года назад

awesome

@user-de2yd7cm9r Год назад

thanks cog

@RandomBR-RLJoe Месяц назад

How does AC look like in circuit? Does it go around the circuit and come back?

@sergedenovo2389 4 месяца назад

GOD, can you drag it out anymore? So house is AC car is DC. …Man oh man!

@LeoChaseTheMythMaster Год назад

I always come here if I'm unsure about something.

@y93a81 9 месяцев назад

SLAYY

@Abz4pf 9 месяцев назад

Glazing fr

@obaasan_loves_cebek Месяц назад

@@Abz4pf brainrot frfr

@katierobinson5627 2 года назад

Not me sitting my physics GCSE paper 2 in an hour and a half 💀💀

@isaacroy1160 Год назад

How was it 💀

@bikusmoto59 5 месяцев назад

Why is AC better than DC for mains supply?

@user-ov9vt2wk9p 2 месяца назад

Im so cooked🔥🔥🔥🔥

@Ordlet 3 года назад

Easington

@jimbob1017 Год назад

rock on

@thebeetle1656 9 месяцев назад

just like AC/DC

@Gravity_Skye Месяц назад

Me walking into my exam knowing that ac/dc is a band (and nothing else):

@supermila3759 2 месяца назад

acdc reference

@nishtakasundass6669 4 года назад

Ac of Nikola Tesla v/s Dc of Thomas Edison. Am i right?

@aidanstallibrass5774 4 года назад

No clue

@kate___lynch 3 года назад

Aidan Stallibrass then why did you even reply?😂

@randomshit1673 3 года назад

@@kate___lynch because

@aadityasrivastava6887 2 года назад

Nah AC/DC of back in black and highway to hell

@lola100yearsago8 3 года назад

fLuCtUaTiNg

@aleclindsay6457 Год назад

Tbh mate. U can have my children

@adyankhan9187 Год назад

why am i watching this in y7

@suckmydick2996 3 года назад

Lol who’s watching for school work?

@ngpta2967 3 года назад

nah i just watch this for pleasure

@lola100yearsago8 3 года назад

@@ngpta2967 fun

@K4d3n_94 2 месяца назад

👉🏿👈🏿🥵

@drd6482 3 года назад

#bigw

@foelancer7625 3 года назад

i prefer coles