GCSE Physics Revision "Resistance of a Filament Lamp"

[@danfirth3017]

Got three 9s in sciences thanks to these vids, cheers sir

[@countryboy3589]

Well done man! got my GCSE’s coming up in June and absolutely shitting myself

[@blacksheep9144]

@@countryboy3589 you guys are lowkey kinda lucky

[@ZeroMirrorr]

@@blacksheep9144 Not really. If you didnt do well in the mocks and didnt revise for them you were pretty much screwed last year.

[@KamisatoElias]

@@ZeroMirrorr exactly

[@user-su6js9po4l]

@@ZeroMirrorr but more people got the top grades (7-9) than ever before. Even if they are predicted, you are more likely to achieve a high grade + no exam stress

[@rosalina6677]

Thank you so much for these videos. In my opinion, electricity is the most difficult topic to get my head around in the Edexcel specification. You simplify everything and go through it step-by-step, which not all teachers do. Thanks again!

[@spamaccount9456]

Worldwide Doge *radioactivity* cough cough

[@emi_chan8031]

@@spamaccount9456 magnetism COUGH

[@ashwin9625]

this is aqa spec tho

[@Ali_R7]

this is aqa

[@oscarwalsh3404]

if you had a penny for every person you helped.....

[@dreamer5769]

my man here charges £975 for a school visit. lmao. well deserved though, he's an actual legend

[@hsudhhgfhshbdbxhd2982]

@@dreamer5769 lol thats cheap for a legend

[@Husna12342]

He would be a millionaire

[@JRsingh123]

@@dreamer5769 how do u know

[@hmc1398]

The blazer is off, Shit just got real

[@summit5602]

It's 10:39. Exams at 1pm. Cramming at its finest, lads.

[@lukemandalore7690]

yet you comment

[@samtl]

@@lukemandalore7690 lmfao

[@kpananth]

i thought i'd never understand electricity until i found these; thank you so much !

[@karthikayoganathan3168]

Fr 😩

[@raving888]

Thank you so much. Your explanation of voltage in terms of energy really helped my understanding of electricity.

[@Freesciencelessons]

Thanks. I appreciate your comment.

[@tmproductions7371]

Hey brotherman, thanks a bunch for your dope videos that helped me with my gcse

[@samimacrae7421]

I cannot describe how helpful this man is thank you so much!!!!

[@MrNakedWizard]

Thank you for the video, you are clear and concise. From Britain

[@elliebarnard5064]

you're helping me understand the topic of electricity so much better now so thank you.

[@CozierStitches]

I really can’t RESIST these videos sometimes :)

[@honeyboo4735]

god bless you, i am watching all the adds for you!

[@RandomVids-zm4zh]

really helpful, I've gone through all the vids

[@zainm217]

thanks 🙏 was trying so hard to wrap my head around this subject

[@sarahflannery318]

Hi thanks for the great videos why doesn’t the current increase as much as the potential difference?

[@Freesciencelessons]

Because the current equals the potential difference divided by the resistance. So unless the resistance is 1 ohm, the current will be different to the potential difference.

[@sarahflannery318]

Freesciencelessons Thanks for the reply but i thought that the reason for the resistance increasing was because the current no longer increases as much, why is this ?

[@sarahflannery318]

Freesciencelessons is it because the resistance increases because more energy is needed to drive the current through the lamp, and then using the equation R=V/I if the resistance and potential difference both increase, then the current would not increase as much as it would if the resistance stayed the same?

[@Freesciencelessons]

Yes essentially that's the answer. As the filament gets hot, its resistance massively increases. That means we need a much greater potential difference to drive the current. So the potential difference has to increase a lot to get a relatively small increase in current through. Hope that helps.

[@sarahflannery318]

Freesciencelessons yes it does thank you so much and thanks for the great videos

[@amyanne8330]

Where’s my 2019 people at?

[@faseehanoor9430]

right here binge watching the shit outa this.

[@dalla513]

last minute revision

[@teepark7774]

Amy Anne good luck

[@GEORGE-wu2zn]

Amy Anne here

[@ci6ran]

Getting ready for 2020 GCSE :)

[@cosmandis7809]

My hero

[@xloopd]

1:56 isnt there meant to be a variable resistor in the circuit sir? I have checked other sources and they also contain this, forgive me if I sound too arrogant and correct me if I am wrong

[@ScienceWithShahid]

Sir can you please explain me that why the current through a bulb is high while we switching it on and then reduce when it becomes more brighter than before ? theoritically, if the current flow is less, brightness of the light should decrease but why it is getting more brighter than the brightness while switching it on please reply thank you

[@km-fy7hh]

any year 10s getting ready for 2020? any 2020 people .....just me okay...

[@doz_mtm_3087]

Same

[@nimra479]

Meeeeee

[@stg1325]

Yr11 now

[@aylaa7659]

I got my physics mock tomorrow😭😭 cramming rn! Gcses 2020

[@Agirl3216]

Ironic 😭😭

[@oscarito4333]

hello Sir, I have 2 questions: wouldn't there be a variable resistor in the circuit to produce that graph of the filament bulb? otherwise, I don't see a way to change the resistance or the potential difference. why does the filament get hot at the start of the graph and at the end of the graph? at the start the current is low so surely the filament would not be very hot? thank you!

[@jaffryjaman4951]

What is the function of this graph (filament lamp)?

[@Freesciencelessons]

It shows how the resistance of a lightbulb is not constant. The resistance increases as the bulb gets hot.

[@muneeb4420]

nice belt

[@ImGhostHD]

AMAZING THANKS SHAUN

[@harsonpakeer7499]

i loved the moment when everything just clicked and it made sense.

[@OneMarsyBoi]

Hello

[@eviehooper7977]

Hello, do we need to know the features of the filament lamp and about how the wire lights up, for the exam? Thanks :)

[@sofija6434]

Nah

[@miliabraham6195]

Thnx

[@priyanshiagarwal5381]

YOU = MAGIC.

[@Georgexb]

where can I get your revisison workbook?

[@Hamidafghan97]

In the link above

[@matteopancisi2780]

BY CLICKING ON THE LINK ABOVE

[@MrDoysh121]

If you don’t have an ammeter before the lamp how do you know the current flowing in to measure how the current has changed after passing through the lamp?

[@Freesciencelessons]

Current is never used up by components. If you know the current passing out of a component, then you know the current passing into the component, as it will be the same.

[@MrDoysh121]

That makes perfect sense now you have said it. Thank you very much.

[@arthurchase4652]

bad boy took his blazer off.

[@yahye327]

How does resistors control the potential difference of other components?

[@Freesciencelessons]

The total PD of the circuit is the PD of the cell. The resistor will take a certain PD (higher PD at higher resistance). The remaining PD is for the other components. So we can reduce the PD across the other components by increasing the resistance of the resistor.

[@editedbyjazz]

Okay sir, I just wanted to ask a question: do you want a knighthood / MBE because a petition has gone round and got loads of signatures. PS Good video :D :-) Edit: Actually this is a dumb question who wouldn't want a knighthood / MBE

[@barkruf]

Who else is watching at 1.5x speed so you can get through faster??

[@yadavaadityanandlal]

Thanks for the vedios :)

[@kouminamoto1661]

does anyone know if we have to exactly know why resistance of the bulb increases as the pd across the bulb increases? or just use V=IR to explain it

[@fireemperorzuko8756]

Because in a filament lamp (an example of a light bulb) as we increase the pd so does the temperature as more energy is transferred to other energy stores e.g. thermal. This means that the resistance increases as it now takes more voltage to push the same amount of charge/current through

[@Hazaroth]

Is the current directly proportional to PD³ then?

[@-jaan6943]

not in a filament lamp because the temperature increases, so less current can flow per unit pd

[@Meowshaaa]

Yeah but how do you work out the resistance of a filament lamp?

[@faizasikandar6050]

Is filament a metal or semiconductor

[@SG-we9gq]

Anyone hoping the physics exam is as easy as the biology and chemistry exams?

[@archjanasivasuthan6252]

Thank you!

[@darrenrose5280]

Sir I need some help

[@tayacarver5077]

I don’t understand how we know resistance is increasing. Why would the current stop increasing as much ?

[@lucahervada3697]

We know resistance is increasing as the current across the wire is decreasing. The current would stop increasing as much, as, when you increase the current, the temperature across the circuit increases. You need to know that as current increases, temperature increases. An increase in temperature also means an increase in resistance, which causes the current to gradually not increase as much. I hope this helped.

[@tortie481]

Omg hes not wearing a suite

[@fammok2400]

Probably because it was posted in June and it's summer time🤷🏻‍♀️

[@lilpinkbeananooshaullah786]

Tor2sn0rt RBLX he is .hes just not wearing the blazer

[@anushahakbar3980]

no way hes not wearing a blazer

[@sophieshaw2239]

I have a physics mock in half an hour

[@misstugce8548]

I am turkish and expatriate in england I hate science lessons very difficult I dont understand anything from science class Idk how to do it🤦🏻‍♀️

[@fireemperorzuko8756]

Rewatch these videos, you'll get it

[@player-ic9yj]

2020 has entered the chat

[@hayaalshadafan651]

Am I the only year 9 learning this?

[@fireemperorzuko8756]

No

[@loopylululand3641]

[@St-jh8pk]

Thank you!