GCSE Physics Revision "Resistance of a Filament Lamp"

Рет қаралды 318,202

7 жыл бұрын

GCSE workbooks www.amazon.co.uk/Dr-Shaun-Don...
School licenses from 40p per copy www.freesciencelessons.co.uk/...
In this video, we look at the resistance of a filament lamp. We start by looking at what exactly is a filament and then we explore why the resistance of filament lamps is not proportional to potential difference.
This video is based on the AQA spec. If you are following a different exam board then you should check your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.
Image credits: creativecommons.org/licenses/...
Student studying: Gnarlycraig
commons.wikimedia.org/wiki/Fi...
Resistors "Afrank99
commons.wikimedia.org/wiki/Fi..."
Incandescent light bulb "KMJ
commons.wikimedia.org/wiki/Fi..."
Torch bulb "commons.wikimedia.org/wiki/Fi...
Cropped from original image"
Close-up of filament "Lander 777
de.wikipedia.org/wiki/Datei:F..."
Old incandescent bulb "Dickbauch
commons.wikimedia.org/wiki/Fi..."

Пікірлер: 104

@danfirth3017 4 жыл бұрын

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

@countryboy3589 4 жыл бұрын

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

@blacksheep9144 3 жыл бұрын

@@countryboy3589 you guys are lowkey kinda lucky

@phase0400 3 жыл бұрын

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

@KamisatoElias 3 жыл бұрын

@@phase0400 exactly

@user-su6js9po4l 2 жыл бұрын

@@phase0400 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

@oscarwalsh3404 5 жыл бұрын

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

@dreamer5769 5 жыл бұрын

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

@hsudhhgfhshbdbxhd2982 3 жыл бұрын

@@dreamer5769 lol thats cheap for a legend

@Husna12342 4 ай бұрын

He would be a millionaire

@JRsingh123 3 ай бұрын

@@dreamer5769 how do u know

@hmc1398 3 жыл бұрын

The blazer is off, Shit just got real

@rosalina6677 5 жыл бұрын

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 5 жыл бұрын

Worldwide Doge *radioactivity* cough cough

@emi_chan8031 Жыл бұрын

@@spamaccount9456 magnetism COUGH

@ashwin9625 11 ай бұрын

this is aqa spec tho

@Ali_R7 11 ай бұрын

this is aqa

@summit5602 5 жыл бұрын

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

@lukemandalore7690 3 жыл бұрын

yet you comment

@samtl Жыл бұрын

@@lukemandalore7690 lmfao

@kpananth 6 жыл бұрын

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

@karthikayoganathan3168 5 жыл бұрын

Fr 😩

@raving888 5 жыл бұрын

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

@Freesciencelessons 5 жыл бұрын

Thanks. I appreciate your comment.

@Fareeda212 3 жыл бұрын

I really can’t RESIST these videos sometimes :)

@samimacrae7421 3 жыл бұрын

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

@tmproductions7371 7 жыл бұрын

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

@MrNakedWizard 5 жыл бұрын

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

@amyanne8330 5 жыл бұрын

Where’s my 2019 people at?

@faseehanoor9430 5 жыл бұрын

right here binge watching the shit outa this.

@dalla513 5 жыл бұрын

last minute revision

@teepark7774 5 жыл бұрын

Amy Anne good luck

@GEORGE-wu2zn 5 жыл бұрын

Amy Anne here

@Hvxu 4 жыл бұрын

Getting ready for 2020 GCSE :)

@elliebarnard5064 4 жыл бұрын

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

@km-fy7hh 5 жыл бұрын

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

@doz_mtm_3087 5 жыл бұрын

Same

@nimra479 5 жыл бұрын

Meeeeee

@stg1325 4 жыл бұрын

Yr11 now

@aylaa7659 4 жыл бұрын

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

@Agirl3216 4 жыл бұрын

Ironic 😭😭

@honeyboo4735 5 жыл бұрын

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

@RandomVids-zm4zh 6 жыл бұрын

really helpful, I've gone through all the vids

@zainm217 Жыл бұрын

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

@cosmandis7809 7 жыл бұрын

My hero

@Shahid_PointofView 6 жыл бұрын

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

@muneeb4420 6 жыл бұрын

nice belt

@ImGhostHD 4 жыл бұрын

AMAZING THANKS SHAUN

@yadavaadityanandlal 5 жыл бұрын

Thanks for the vedios :)

@St-jh8pk 3 жыл бұрын

Thank you!

@harsonpakeer7499 2 жыл бұрын

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

@quantum_martian 2 жыл бұрын

Hello

@miliabraham6195 4 ай бұрын

Thnx

@priyanshiagarwal5381 4 жыл бұрын

YOU = MAGIC.

@sarahflannery318 6 жыл бұрын

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

@Freesciencelessons 6 жыл бұрын

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 6 жыл бұрын

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 6 жыл бұрын

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 6 жыл бұрын

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 6 жыл бұрын

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

@barkruf 4 жыл бұрын

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

@jaffryjaman4951 7 жыл бұрын

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

@Freesciencelessons 7 жыл бұрын

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

@arthurchase4652 2 жыл бұрын

bad boy took his blazer off.

@faizasikandar6050 4 жыл бұрын

Is filament a metal or semiconductor

@kouminamoto1661 3 жыл бұрын

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 3 жыл бұрын

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

@Meowshaaa 3 жыл бұрын

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

@SG-we9gq 5 жыл бұрын

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

@eviehooper7977 6 жыл бұрын

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

@sofija6434 5 жыл бұрын

Nah

@xloopd Жыл бұрын

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

@MrDoysh121 4 жыл бұрын

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 4 жыл бұрын

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 4 жыл бұрын

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

@yahye327 2 жыл бұрын

How does resistors control the potential difference of other components?

@Freesciencelessons 2 жыл бұрын

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.

@sophieshaw2239 2 жыл бұрын

I have a physics mock in half an hour

@darrenrose5280 4 жыл бұрын

Sir I need some help

@Georgexb 7 жыл бұрын

where can I get your revisison workbook?

@Hamidafghan97 5 жыл бұрын

In the link above

@matteopancisi2780 4 жыл бұрын

BY CLICKING ON THE LINK ABOVE

@Hazaroth 5 жыл бұрын

Is the current directly proportional to PD³ then?

@-jaan6943 3 жыл бұрын

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

@editedbyjazz 3 жыл бұрын

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

@tayacarver5077 5 жыл бұрын

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

@lucahervada3697 5 жыл бұрын

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.