GCSE Physics - How Transformers Work #82

This video covers:
- Brief summary of what transformers do (i.e. step up or step down the voltage)
- How transformers work
Exam board specific info:
AQA - Separate/triple science and higher tier only
IGCSE Edexcel - Separate/triple science and higher tier only
Edexcel - Higher tier only
OCR 21st Century - Separate/triple science and higher tier only
OCR Gateway - Separate/triple science and higher tier only
Maths Playlist:
• GCSE Maths (9-1)
GCSE Chemistry playlist:
• GCSE Chemistry - Atoms...
GCSE Biology Playlist:
• Video
GCSE Physics Playlist:
• Video

[@humphrey1238]

To the lovely people at Cognito, You have been a lifesaver for me and my friends during our GCSE’s this year. I don’t know what I would have done without your amazing videos that are so simple yet so unbelievably helpful to all. I cannot learn from textbooks or revision cards, so when it comes to doing past papers, I was getting really low marks due to my lack of understanding: you have changed that. Thank you so much for everything and I cannot give you all enough praises. YOU HAVE SAVED MY GCSE’S!!!! Thank you again and I love you all ❤❤❤

[@absolutelyaweirdo]

How was the exam?

[@laramoisii6450]

exam tomorrow 💪

[@82MCG]

rip us

[@pwrkeyring4619]

update?

[@jonasjacobss2002]

Lol same

[@hilkiahconstant9733]

Same

[@peterbob3785]

Nice

[@sgtmymorph2494]

doing my last gcse exam tomorrow and its physics. You have helped (including this video) through my entire gcse science curiculem. My teachers were unrealiable due to illness/ covid and then i found u. You saved my gcses and i will be forever thankful. Keep up the hard work and carry on helping other students.

[@frozenmusicchannel2.086]

Even I'm my last exam tomorrow 😊. Thank u

[@lightningboltt5437]

Same

[@yooooo7626]

Same here gl everyone

[@user-me6te9gi1x]

Fr we can do this guys

[@njalinferno]

Good luckkkk!

[@faa_2468]

Dear Amadeus and Tom, I don't know if you'll see this comment but I wanted to thank you for your amazing and helpful science videos . They were a life saver for me , particularly for physics ! I'm a visual learner so your diagrams and clear explanations were perfect in helping me understand tricky content . You made science a lot easier for me and now that the only exam in my way is Physics Paper 2 , I couldn't turn a blind eye to your channel. Thank you for being a part of my GCSE triple science journey ! From Fatima, Yr11 P.s- I loved your website too , it was super useful !

[@Cognitoedu]

Ah thank you so much Fatima, this was so lovely to read 🤩 We're really glad you liked our content and hope your results go well 🤞

[@MarveOfficial]

whooo hooo

[@adetundepowell4321]

This channel is a gold mine, it really helps me prepare for Physics csec thank you!

[@Cognitoedu]

Ah thanks so much Adetunde!! 😊

[@jaswanseenarine4412]

Same

[@Pr_xity]

Def failing phy

[@heirofsugar]

your videos are so frickin helpful ive got mocks next week and i didnt get this electricity chapter thank you so muchhh

[@zacj210]

did you pass

[@heirofsugar]

@@zacj210 yess got an A* in physics

[@Khushi-qo6qx]

@@heirofsugar can u give me some tips for studying i have mocks next week

[@heirofsugar]

@@Khushi-qo6qx i know you've probably heard this alot but just do pastpapers, for physics and for igs in general there are alot of repeated questions that come in pastpapers and you can easily score if you remember the points, maybe write them down somewhere so you won't forget the points, thats what I did, especially for this chapter since it was the one I found to be the most confusing

[@Khushi-qo6qx]

@@heirofsugar thxx

[@asmacampbell6661]

Goodluck for paper 2 yalll💪💪💪💪

[@Yara-fs5ej]

you too 💪💪💪

[@atsmediagh]

🎉❤😢

[@ArafatKhanMusic]

Ending my IGCSE exams today by watching this amazing informative video (Physics P2). Thanks team cognito❤️

[@ahmadqasim4773]

Amazing how you seem to make confusing topics so much simpler. Great work 🙏

[@vox5136]

To those to people who disliked this video, Did you really not like this video or did you just want people to notice you? Because seriously this video is one of the most helpful physics videos I have seen in a while.(yes I added a like.)

[@divyansh22b]

some people dislike videos because they dont want such videos to show up in their recommendations. Not necessarily everyone hates such videos, the utube algorithm works that way, if u dont want such videos to show up in ur recommendations, u can dislikie a video, tho this is a rlly bad algorithm and must have some other option, but cant help, *kira*

[@nabeelahmed4862]

@@divyansh22b you can just click the 3 dots on the video and click/ tap "Not interested".

[@f098c]

3 hrs left 😍

[@Cognitoedu]

If you’d like to practise what's covered in this video, check out the lesson on the Cognito platform: cognitoedu.org/coursesubtopic/p2-gcse-aqa-h-t_6.09 - it's totally free, and has been built to make learning and revision as easy as possible. The main features are: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A comprehensive bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

[@progamerstop242]

maybe pin the comment?

[@progamerstop242]

also this was quite helpful

[@albert9248]

Cheers, my exams are in 3 weeks or so and this has definitely helped with one of the harder physics topics!

[@Cognitoedu]

Great to hear we could help Albert, good luck with your exams 🤞

[@zinniaward8549]

How did they go?

[@albert9248]

@@zinniaward8549 i got a 9 so they must have gone well. It feels so long ago now too

[@zinniaward8549]

@@albert9248 congratulations, that's amazing!

[@Bumbaclart]

Got ours tomorrow?

[@lellow7087]

ready for physics paper 2 💪💪

[@TypicalSullyEditz]

less gooo

[@zainm217]

I'm super pleased with this video. It explained not only **how** transformers work, but included the reasoning behind their design. I watched a similar video from FreeScienceLessons (don't get me wrong, I use that resource all the time!) but it didn't go in-depth as this one, I was asking the whole time **why** is it like that and what are the benefits of a transformer being like that. This gave me a better understanding, thank you.

[@Jordan-bb4xt]

Thanks for this! I was doing work on this and finished a few days ago. I'll go back (online Docs) and rewrite it! Thanks!

[@hhanaaaaaah]

wow!... my book says a whole different equation to find the number of turns in the 2ndary coil even when the number of turns in the primary is given (when in fact its just half of the primary!)... this video opened my eyes!. too bad how our school system so badly wants us to fail by studying very complicating stuff in their textbooks while these videos exists!... THANK YOU! seriously

[@begadplays]

Thank you so much you made this topic much easier

[@coolcow5193]

Quick, straightforward, not wasting my time. Thank you.

[@rabiaayaz3669]

Exam in 2 hrs

[@Enveixz67]

W We passing exams with this one boys 🗣️📢🔥🔥🔥🔥🔥🔥

[@Mariassimplethings]

Sameeeee 😢❤

[@Draggie306]

Exam in just over an hour, here we go!

[@ahmbnmn6381]

You deserve more people watching and subscribers

[@Cognitoedu]

Aah thanks ahm!! 😊

[@withoutname3922]

Watching 1 day before exam will say how it went tomorrow

[@withoutname3922]

Prolly got an 8 or 9

[@sorisetto6004]

Exam in a couple of weeks this really helped me out i love you guys ❤❤😊

[@daraaa.m]

I love cognito sm omg idk how id survive my GCSEs

[@tasfiatasnim6035]

Thanks a lot!!! Love from Bangladesh❤

[@mitaaslam4273]

Me from the Same place xD

[@hannahk4086]

Thank you for all these great videos I have a lot to revise for my exams

[@Cognitoedu]

Best of luck! 😊

[@user-xz4hz2ow7w]

Exam tomorrow

[@alexlambert4554]

best of luck everyone. thanks for everything Cognito.

[@thatluigi]

gl

[@jammydoger9581]

Do Decepticons work differently? Or do they work off the same concepts

[@nalinikommanapalli539]

THANK YOU Helps understand the concept in simplified terms..

[@Cognitoedu]

Thanks K, glad it helped 👍

[@saharsiddig9834]

Exam today 😭😭

[@ahmedjawad9360]

today or tmrw??

[@noelle4145]

Thanks for the video how does increasing voltage minimise energy loss?

[@heirofsugar]

because then there will be less current as voltage is inversely proportional to current (V= P/ I)

[@ashenafiesubalew2777]

Wooooo

[@raaghavmathur5909]

You explain wonderfully

[@artmakeslifebeautiful8594]

Good night 💤

[@user-it5ge6ck5e]

Exam today🤲

[@lilcookie7118]

I've read that if the secondary coil is not there or in other words has an open circuit then this leads to the decrease of the current in the primary coil i don't know why the only reason i found was due to back emf generated due to self induction but i can't figure out why it decreases sooooo much and not just a little bit Help would be appreciated and Thank u all for your amazing help

[@artmakeslifebeautiful8594]

I have my last exam in 10th grade tomorrow morning 🎉buy sophomore year and hello junior

[@pikachuu-zi7ik]

THANK YOU IT MAKES SO MUCH SENSE NOW!!

[@suxela360]

Superb video as always! Keep up the good work.

[@maryjones5517]

You're the best!!! You should be a scientist!

[@elisesl7107]

thanks for explaining it so simply!!

[@Cognitoedu]

You're welcome Elise!

[@haykalrubiarto1405]

Dear Cognito, I love you

[@madmachine1]

Two questions: ONE if the transformer can be used in both directions, why labelling them "step up" and "step down" transformers? TWO now that many renewable generators are connected to low and medium voltage grids, how transformers will work if a given area has more power generated than load?

[@user-gq3li2vd5u]

superb!

[@iloveeveryone5545]

Physics paper 1 tomorrow good luck to my fellow year 11s 😭

[@xenonclipzz1270]

Thank you so much, it was a great help

[@sukicchan]

it took me thirty minutes to understand this shit... anyway thanks for the clear explanation my teacher has been explaining this for months now i finally get it...❤

[@ahalyaperera7713]

Best video on Transformers!!

[@mday8363]

Tomorrow everyone skip the 6 markers because we have to show edexcel that we are independent.

[@zeninfinity6645]

I understand how it increases voltage, but how does it decrease current at the same time?

[@EpicNugget570]

The underated side of KZbin

[@zubeenbhat9235]

1st view 1st comment and 1st like by the way video was awesome.

[@benduffy3436]

This is rly helpful but when you said alternating "potential difference" did you actually mean alternating current?

[@nabeelahmed4862]

Yes he did

[@zainahmad1111]

potential difference is voltage

[@kandy9933]

O level exam in 1 hour 😮. Thanks for the help

[@hobbsshort7887]

Yeah

[@hasinirajkumar6708]

Thank you so much it helped a lot

[@Rxsskko]

Thank you for saving me from getting beaten by my mother

[@fifkebab]

this channel is so adorable

[@hamza14141]

I've got a question, what happens when a dc current is used? I got this question in a past paper and cant understand why it won't work.

[@starlightglitters345]

DC current can't be used as change in current cannot be generated by DC meaning that there is no changing in magnetic field to induce a voltage across the secondary coil. DC means direct current and flows only in one direction

[@hamza14141]

ok thank you!

[@Duocek]

The iron core can't be vital in the functioning as transformers can work (just not as well) even without it right?

[@naveenprabhath4199]

what's the point of having a step up transformer and then having a step down one? I don't really understand it

[@josephlau13d77]

to increase and decrease the voltage as required- obviously an entire city would need more voltage than a single house

[@herrpat5572]

to decrease the energy costs because if u use normal wires u would lose energy as heat. to solve this problem u'll hve to use either thicker wires (which is expensive) or jst use the transformers (cheaper)

[@luciegm3236]

you've got your step up transformer to go into powerstations as they need lots of power to disperse to different areas. But the step down transformer means that the voltage going into your house is low enough that it won't be dangerous to use. hope this helps

[@alvaropadilla4296]

All hail Cognito

[@rocketfuelwithagun]

I don't get it, could you not just make an infinite amount of electricity this way since you arent actually losing anything, the secondary coil is just picking up the electromagnetic waves?

[@jackcox9471]

last exam today!!! 🦾

[@heshammohamed422]

thank you so much, finally i understood it

[@HomegrownTyrone]

Thank you!

[@youssefzareli]

Thanks a lot bro

[@nethunamaraweera3878]

Hey, I have a problem. What if there was a direct current applied across the primary coil?

[@user-nm1vc7wz4s]

transformers only work with alternating current if there’s an direct current apply there’s no change to the magnetic field:D

[@MI-lo2hj]

So it has nothing to do with solenoids?

[@mrzombie4573]

Thank you sir

[@hafsaqamar737]

Is it possible for you to share the powerpoint of this video?

[@ezekielyeboah6616]

Exam morning guys

[@aei1773]

can you do a video on dynamos & alternators pls

[@Tesyeax]

THANK YOU SO MUCH

[@complexity_YT]

Makes 100% sense

[@XNaruto_plays5027]

Man there missing out at some key details tho, for e.g a transformer increases voltage at the cost of decreasing current which keeps overall power loss (formula P=I^2(R)) to a minimum, transformers dont generate power thier job is to transform current into voltage

[@Hilyashipanga]

Is secondary coil always that side?

[@sindeeeed]

Yea

[@valeriiabondarieva5871]

Hi, I didn't quite get how a potential difference is created within the primary coil. Could anyone explain, please?

[@notey1806]

When u move a magnet through the coil it cause current to flow in the coil, by using Ac the feild alternate or change direction which u can also say feild moving in the coil generating current when the current flow it generate potential difference ( sorry for badly explaining but it make sense for me )

[@ashenafiesubalew2777]

Thank you

[@joelleee333]

thank you so much

[@xii_97]

When he said straight passage, did he mean DC current?

[@user-nn2me4og3e]

Can we prepare for olevel from these videos plzz anyone help me to understand

[@Clippy4you]

coming back in y13 👍

[@nextgeneration6898]

I know how transformers work, they just become cars and can turn into robots...

[@elisasee7538]

but how does it induce the pd, its not the generator effect rite? cuz the wire or core isn't moving? I'm very lost :(

[@elisasee7538]

( in the secondary coil)

[@elisasee7538]

I get the beginning bit i think, its like an electromagnetic rite? The pd and current cause wire to have a magnetic field, induces the magnetically soft iron core rite? but how does pd in secondary coil come along?

[@m.67599]

there is alternating current in the circuit, so that means the magnetic field is also alternating. So, because the magnetic field is also moving (alternating), it will induce the current in the secondary coil

[@hashnataimur483]

1.Describe how transformer works 2. State one way in which energy is lost from the transformer and from part it is lost

[@elisasee7538]

@@hashnataimur483 ?

[@memoonaqamar6657]

Besssssst channnnel !!!!

[@mahimjr1971]

thanks

[@fionakeira8346]

thanku sir

[@goodrabbit7265]

May I know the exact meaning of “induced” please? I’ve been searching but I don’t understand what they explain. Please help me😭😭 Thank you

[@coolcow5193]

it is where a magnetic material goes into a magnetic field and (magically) becomes a magnet and has its own magnetic field.

[@Fungi_45]

2:43

[@wojtekgawuc7267]

still no clue

[@aryahaque5210]

Last GCSE exam after few hours!

[@wakenshare9240]

Exam today..

[@MISCHEIVIOUSLOKICHESS]

Test in a few mins 😂😂

[@TypicalSullyEditz]

huh mins? its today loool

[@atgaming246]

exam in 1 hour

[@Jumpingcat123]

Exam today

[@ArsyaUtomo]

Rollout

[@studyroa9045]

amazig

[@nightown71]

Tomorrow my exam lol

[@mohammedhuraira9187]

Autobots rollout

[@that1french]

Hahah