My science GCSE has just been officially completed. I owe it all to you, I completely hated science this time last year, would've been ecstatic for a C grade. Never got above a D grade in any mocks. Your channel completely changed my attitude towards science and hopefully I can bag a few A's in Science now. Thank you for all the work you put in to your videos and I'll be sure to recommend your channel to people who are taking their GCSEs in the future. Not a single revision source out there is better than your straightforward, concise, simple, and 'everything you need to know' channel. Thank you once again, you taught me so much! Anyone reading this that is doing Science GCSE in 2018. USE THIS CHANNEL! Use his 9-1 playlists. I powered through the playlist (the outgoing spec playlists - B1, P1, C1 etc.) a few weeks before exams started (If only I discovered this channel sooner Id've started earlier), and then powered through them once again night before exams and then did lots of past papers. Definitely the best GCSE Science revision source. THANKS SO MUCH SHAUN!!!!🙌
You've broken down Physics for me to the point where I'm beginning to find it interesting, I've gone from a 4 to a 7 and I'm considering Physics for A levels. Thank you!
Thank you sir you have supported me throughout all of GSCE revision- would highly recommend your lessons to people in lower years so your channel helps others achieve their GSCEs. :)
Hi sir, I dont understand the definition of potential difference but I get that potential difference shows us what amounts of energy are being transferred in a circuit. Does it matter that I dont understand the exact definition? Or must I go into more detail to understand it? Thanks
Hello! As a year 11 student who has been watching your videos religiously over the past few months, am wondering whether or not the majority of your videos cover topics that apply to all exam boards ( in my case, edexcel ) A response would be much appreciated :))
@@Freesciencelessons i agree,i do understand the topic but i just need a bit of reinforcement, also sir do you have any tips for staying focused as i often procrastinate and barely do any revision in 1 day
hi sir, and people, hope you all are fine! I don't get what the chemical properties of the halogens is limited to reactions with alkali metals actually means? I don't get it help please. Kind regards.
3:04, why don't the first lamp near to the negative terminal gets 9V , i guess that the PD is affected for the second lamp only, what is there to interfere the first lamp in getting 9V PD?
Potential difference does not really work like that I'm afraid. The total potential difference of the cell has to be shared out among all the components. Components with a higher resistance get a greater share of the potential difference.
hi i understood everything but not entirely sure what voltage is. is it the energy transferred from the electrons to the components? and also do you have an exact definition for "charge" ? thanks
In a sense yes. The voltage or potential difference tells us the amount of energy transferred by a coulomb of charge. Charge is simply the total number of electrons (in the case of electrical circuits) but we usually refer to a coulomb of charge which is a very large number of electrons.
i find potential energy such a difficult concept to understand. Is it the same as the analogy of the water in a tank? The more amount of water(the charge) the greater the pressure at the end of the tank(representing voltage) and when the charge begins to run out(water), the voltage (pressure) also decreases and that's why a battery stops working?
OK, think of potential difference as giving us an idea of the energy carried by the electrons. When they leave the cell, the electrons are carrying a lot of energy. As they pass through components (eg a lamp), some of this energy can be transferred to other energy stores (eg light). When the electrons return to the cell, they are carrying no energy. Some students get really hung up on what happens when an electron passes through one lamp and then another. How do the electrons "know" that they have to transfer some energy to the first lamp and then some to the second lamp. My advice is to simply not worry about this. It's an A Level Physics concept and you should not let it stop you from getting potential difference. I hope that helped.
I know this guy gets like hundreds of comments saying this but… it’s my first time using him. I’ve got a test tmrw when I get the results back I’ll make my decision about him
Yo I’m bad at physics in my mocks I got a 5 in triple. I’ll come back after watching your videos and tell you what I got in my GCSE’s which are in a couple of months
Hi, I really enjoy your content and revision. Whilst sharing you resources with my friends whilst revising we were curious to the origin of your accent? Can you please tell us where it comes from as we have a bet that you're Irish, North Eastern, Welsh or German.
Thanks sir for the great videos! I have a question please: if the electrons give all the energy provided by the cell to the bulb, then how can the electrons keep moving after leaving the bulb?
hi sir i dont know why but i dont seem to be able to understand the meaning of potential difference could u please tell me what it is in a form that is simpler to understand thank u very much
Hi. Potential difference is a pretty difficult idea to understand but think of it is as giving us an idea of the energy carried by the electrons (this is a simplification but it's helpful). If the electrons pass through a component (eg a lamp) and energy is transferred, the electrons will pass out of the lamp with a lower potential than they had when they entered the lamp. The potential DIFFERENCE is the difference in the electrons' "energy" between entering and leaving the component. If we placed a voltmeter across the lamp, it would show the potential difference. If we had a cell in a circuit with no components at all, then the potential difference across the cell would be zero volts as the electrons return to the cell with the same energy as when they left (strictly speaking, wires have resistance so a little bit of energy would be transferred but we'll ignore that).
Would it be correct to say that as charge flows throughout a circuit and components like a lamp, electrical potential energy is converted to kinetic energy which is converted to light and heat energy?
Are you thinking of the voltmeters as branches? If so you need to remember that voltmeters are not counted as branches (effectively no current goes through a voltmeter so it's not a branch).
A branch is a point where the current can split. I explain it in these two videos: GCSE Science Physics (9-1) Current in parallel circuits GCSE Science Physics (9-1) potential difference in parallel circuits
If 9V means that 9 joules of energy is transferred by every coulomb of charge, then if all of this energy carried by the electrical current is transferred into light/thermal energy in the lamp, then how does the electrons have any energy or "pushing force" left to return to the opposite side of the cell? Any help is appreciated!
Potential difference is shared by all the components in a circuit, components with higher resistance take a larger portion of PD than others and I'm pretty sure not ALL of it is taken by both lamps and some is used in the wires too. However this is unnecessary for GCSE, so I'm guessing that's why Dr Donnelly didn't include it, if you'll do A level physics or as a degree I'm sure they'll show it there.
Hi sir, this is a bit unrelated but google wont tell me the correct answers. How do you determine the half-life of something and the mass number of an atom?
Maheen Shahzad Mass number of atom=number of protons and neutrons Half life= the time is takes for a nuclei to split in half. So if the half life eg is 20 days and initial count rate( this is what it originally was) is 400 counts per secound. And the question was to determine the count rate after 60 days. You would do 400- start of 200- 20 days 100- 40 days 50-60 days So the half life after 60 days=50 counts/s
My science GCSE has just been officially completed. I owe it all to you, I completely hated science this time last year, would've been ecstatic for a C grade. Never got above a D grade in any mocks. Your channel completely changed my attitude towards science and hopefully I can bag a few A's in Science now. Thank you for all the work you put in to your videos and I'll be sure to recommend your channel to people who are taking their GCSEs in the future. Not a single revision source out there is better than your straightforward, concise, simple, and 'everything you need to know' channel. Thank you once again, you taught me so much! Anyone reading this that is doing Science GCSE in 2018. USE THIS CHANNEL! Use his 9-1 playlists. I powered through the playlist (the outgoing spec playlists - B1, P1, C1 etc.) a few weeks before exams started (If only I discovered this channel sooner Id've started earlier), and then powered through them once again night before exams and then did lots of past papers. Definitely the best GCSE Science revision source. THANKS SO MUCH SHAUN!!!!🙌
What grades did you get?
I am sooo scared for GCSEs lol.
TheUltimateConspiracyTheorist me too ....
TheUltimateConspiracyTheorist same
@duwang @Kasim Pro What did you guys get?
You've broken down Physics for me to the point where I'm beginning to find it interesting, I've gone from a 4 to a 7 and I'm considering Physics for A levels. Thank you!
did u choose A level physics also what grade did you get in gcse
He isn’t replying for sure
@@deadlysamurai5192 fr
@@Electrico11HDFr 😂
@@moterstorm7990what grade did you get?
watching these at 2x speed the nigh before a test hits different
yup
100%
me rn lmaooo
Me right now
me rn
this man has got so many people passes in gcse’s it’s rediculous and i’m hopefully going to be another come june
im doing it in may june too!
Did u guys pass???????????
@@elliewebster thats what im thinking
when he said pd was fairly straightforward.
*shakes head*
Thank you sir you have supported me throughout all of GSCE revision- would highly recommend your lessons to people in lower years so your channel helps others achieve their GSCEs. :)
I have learnt a lot more from watching your videos than looking through a text book. THANK YOU!
Are you planning to do A-Level videos once the current year is done with GCSEs? That would really help
You're getting me through my GCSEs but I have no ideaa what I'm going to do for A level without your vids :/
Same :(
Don't worry, there is someone who does A-level physics on youtube. You probably found him
Dr. A Physics?
Sure he does A-level as well
who?
This guy is so good we watch him in my classes
Thank you sooooooo much for your videos, my science GCSE was amazing and your videos had a major influence towards this. Continue doing what you do!
dude you're amazing, I'm currently revising in the morning of my exam
Thank you sooooooo much!!!! I have my physics gcse tomorrow and your videos have really helped.
i learned more from you in 4 and a half mins than i did in 5 lessons from my teacher
Sir your videos are amazing and while you don't even smile in between, you resembles me like eminem teaching with no cuss words...
LMAOO
you are a live safer my teacher didn’t teach us this at all and now yr11 mocks i gotta teach myself 0:01
nah fr i got my physics mocks for yr 11 asw n im teaching myselff
Hi sir,
I dont understand the definition of potential difference but I get that potential difference shows us what amounts of energy are being transferred in a circuit. Does it matter that I dont understand the exact definition? Or must I go into more detail to understand it?
Thanks
Did you ever get your answer?
you make things so easy to understand, thank you
damn this whole chapter of physics makes much more sense now (revising last minute at 1am 😭)
this man must be protected at all costs
I just can't thank you enough. You're a blessing!!!!!
who else says 'Hey Shaun!' when he says hi welcome back?
Just me?
Great...
yep its just you ngl
On your left
I say it in my head ngl
by the way there is a typo at 0:54, is supposed to be "carried" and not "carry"
Will you be doing A level vids once you finish all of the ones for GCSE?
If I pass my GCSEs, it's on him tbh :))
Hello! As a year 11 student who has been watching your videos religiously over the past few months, am wondering whether or not the majority of your videos cover topics that apply to all exam boards ( in my case, edexcel )
A response would be much appreciated :))
These videos cover the AQA spec but the Edexcel spec is very similar.
So if I get asked ‘give a definition of potential difference’ in my exam, what should I put?
It's unlikely to be asked but I would say the energy transferred when a coulomb of charge passes through 1 volt of potential difference is 1 joule.
@@Freesciencelessons what is a coulomb of charge?
Thanks man I watched you last year and I passed my science 😊😊
im yr 9 and got to do an end of year exam tomorrow for science this guy just explained it better than me bloody teacher did
y11 now?
How helpful can one man be
I'm in year 7 and it's still helping me
DeLegend 101 same I’m in year 8 now
Same
same here
delegend 101
I’m in year 4 but I’m a complete nerd and study a lot
If y’all keep in watching his videos and studying from them I guarantee ur gonna get a rlly good GCSE grade.
THIS IS SOOOOOOO GOOD THANKS
thanks sir, got my gcses in 2 weeks phyiscs is my fav subject but electricity is the 1 topic that just sucks thanks for ur help
Electricity is actually one of my favourite topics. It looks like lots of random things but they do all link together.
@@Freesciencelessons i agree,i do understand the topic but i just need a bit of reinforcement, also sir do you have any tips for staying focused as i often procrastinate and barely do any revision in 1 day
Your videos are so helpful ! Thank you
hi sir, and people, hope you all are fine!
I don't get what the chemical properties of the halogens is limited to reactions with alkali metals actually means? I don't get it help please.
Kind regards.
They have the same outer shell electron so they react together well.
MANNN GOD BLESS THIS GUYYY😪😪
3:04, why don't the first lamp near to the negative terminal gets 9V , i guess that the PD is affected for the second lamp only, what is there to interfere the first lamp in getting 9V PD?
Potential difference does not really work like that I'm afraid. The total potential difference of the cell has to be shared out among all the components. Components with a higher resistance get a greater share of the potential difference.
hi i understood everything but not entirely sure what voltage is. is it the energy transferred from the electrons to the components? and also do you have an exact definition for "charge" ?
thanks
In a sense yes. The voltage or potential difference tells us the amount of energy transferred by a coulomb of charge. Charge is simply the total number of electrons (in the case of electrical circuits) but we usually refer to a coulomb of charge which is a very large number of electrons.
these videos are really helpful, I'm really thankful that I found this channel. Maybe you could make an app tho? For ease of video viewing?
i find potential energy such a difficult concept to understand. Is it the same as the analogy of the water in a tank? The more amount of water(the charge) the greater the pressure at the end of the tank(representing voltage) and when the charge begins to run out(water), the voltage (pressure) also decreases and that's why a battery stops working?
OK, think of potential difference as giving us an idea of the energy carried by the electrons. When they leave the cell, the electrons are carrying a lot of energy. As they pass through components (eg a lamp), some of this energy can be transferred to other energy stores (eg light). When the electrons return to the cell, they are carrying no energy.
Some students get really hung up on what happens when an electron passes through one lamp and then another. How do the electrons "know" that they have to transfer some energy to the first lamp and then some to the second lamp. My advice is to simply not worry about this. It's an A Level Physics concept and you should not let it stop you from getting potential difference.
I hope that helped.
@@Freesciencelessons Thank you very much, it makes so much more sense now, I'll try to not overthink it too much.
I know this guy gets like hundreds of comments saying this but… it’s my first time using him. I’ve got a test tmrw when I get the results back I’ll make my decision about him
go on then
@@zakairud5153 I got second highest in the class!!!! So happy 😃
Yo I’m bad at physics in my mocks I got a 5 in triple. I’ll come back after watching your videos and tell you what I got in my GCSE’s which are in a couple of months
a 5 is calm
at least u have passed
Lolly Tape what did you get?
hi, this has been a long time ago, but just out of interest - what did u get?
What did you get out of curiosity? :)
Thanks so much for helping me with my test
Hi, I really enjoy your content and revision. Whilst sharing you resources with my friends whilst revising we were curious to the origin of your accent? Can you please tell us where it comes from as we have a bet that you're Irish, North Eastern, Welsh or German.
Hes Irish I bet
it's a geordie accent
A geordie accent?? No that is quite clearly a Welsh accent. It's certainly not Irish either.
You're all wrong; he has a Chinese accent... I should know because I'm Chinese myself ;)
He teaches at a school where i live in oldham, Manchester
hi ,could you tell me why the voltage gets shared equally between the 2 lamps and the electrons arent getting used up in the first one ?.
thanks
Thanks sir for the great videos! I have a question please: if the electrons give all the energy provided by the cell to the bulb, then how can the electrons keep moving after leaving the bulb?
It is because they still have some energy though least
the electrons heat the filament then leave the bulb
@@zieemazam8308 But then that would mean the electrons had just transferred all its energy(9V) to light/heat so how would it be able to return?
@@pahgm6222 because the electrons are negative so they are attracted to the positive end of the cell
thanks for the videos, how many exam boards does your content cover?
They're aimed at the AQA spec but there's a load of crossover with the other exam boards especially Edexcel.
Freesciencelessons thanks, imagine a reply from mr Freesciencelessons, you help me sooo much but the gcse are gonna be messed up now
hi sir i dont know why but i dont seem to be able to understand the meaning of potential difference could u please tell me what it is in a form that is simpler to understand thank u very much
Hi. Potential difference is a pretty difficult idea to understand but think of it is as giving us an idea of the energy carried by the electrons (this is a simplification but it's helpful). If the electrons pass through a component (eg a lamp) and energy is transferred, the electrons will pass out of the lamp with a lower potential than they had when they entered the lamp. The potential DIFFERENCE is the difference in the electrons' "energy" between entering and leaving the component. If we placed a voltmeter across the lamp, it would show the potential difference. If we had a cell in a circuit with no components at all, then the potential difference across the cell would be zero volts as the electrons return to the cell with the same energy as when they left (strictly speaking, wires have resistance so a little bit of energy would be transferred but we'll ignore that).
@@Freesciencelessons thank u so much sir i now understand it
Should you say via an electrical transfer, energy is transferred from the chemical store of the cell to the thermal store of the lamp
That's correct. Light is also emitted.
Is all of this still in the AQA specification?I’ve been looking but I’m not sure since this video was posted 7 years ago,thanks.
Yes the spec has not changed and all of this is on the current spec.
damn this unit's kinda hard though
Electromagnetism is HARDER HARDER HARDER HARDER HARDER HARDER HARDER HARDER HARDER 😩
I can smell that Grade 9 all the way from here and my GCSE's are ages away.
You're a lifesaver
Would it be correct to say that as charge flows throughout a circuit and components like a lamp, electrical potential energy is converted to kinetic energy which is converted to light and heat energy?
but why isn't the voltage between the two lamps shared evenly?
KiNG Hawky it’s probably because the lamp with a pd of six may require more energy on its own
Sir thank you very much! Can you explain me what's the difference between voltage and current please?
current is the rate of flow of electricity, and voltage is the potential difference
Last minute revision I have paper 1 in 5 hours
i'm confused to how it can be series if it has branches?
Are you thinking of the voltmeters as branches? If so you need to remember that voltmeters are not counted as branches (effectively no current goes through a voltmeter so it's not a branch).
Freesciencelessons wait so what is a branch then? And how do you notice the difference between a series and parallel circuit, sir?
A branch is a point where the current can split. I explain it in these two videos:
GCSE Science Physics (9-1) Current in parallel circuits
GCSE Science Physics (9-1) potential difference in parallel circuits
You are amazing, thank you so much
Many thanks for your work
If 9V means that 9 joules of energy is transferred by every coulomb of charge, then if all of this energy carried by the electrical current is transferred into light/thermal energy in the lamp, then how does the electrons have any energy or "pushing force" left to return to the opposite side of the cell?
Any help is appreciated!
magic
Potential difference is shared by all the components in a circuit, components with higher resistance take a larger portion of PD than others and I'm pretty sure not ALL of it is taken by both lamps and some is used in the wires too. However this is unnecessary for GCSE, so I'm guessing that's why Dr Donnelly didn't include it, if you'll do A level physics or as a degree I'm sure they'll show it there.
can u please teach it how to work it out bcs i dont understand
Hi , could you make flash cards for new spec please??
Hey sir do you play an instrument?
What is a coulomb. I would highly appreciate a response
Coloumb is the unit for Charge
Never heard potential difference said so many times & I have a physics degree
So you prefer the term voltage?
Are you sure this is GCSE because i have a test on this tomorrow and im in year 7
Please sir do videos under Wheatstone Bridge and Kirchoffs calculations.
1:24 anyone hear that sound??
@Mohammed no? What is it
can someone help me I don't get what a coulomb are
A coulomb is simply a unit of charge. You don't need to know exactly how much charge is in a Coulomb, just that it's a unit of charge.
But what is a cOuLomB
CAN YOU PLEASE RESPOND TO ME how to change the circuit to give a negative value for current and potential difference xx
Turn the battery/cell around
Thank you 💜
Hi sir, this is a bit unrelated but google wont tell me the correct answers. How do you determine the half-life of something and the mass number of an atom?
Maheen Shahzad
Mass number of atom=number of protons and neutrons
Half life= the time is takes for a nuclei to split in half.
So if the half life eg is 20 days and initial count rate( this is what it originally was) is 400 counts per secound.
And the question was to determine the count rate after 60 days.
You would do
400- start of
200- 20 days
100- 40 days
50-60 days
So the half life after 60 days=50 counts/s
Do these videos apply to all exam boards?
whats the difference between potential difference and coulombs
do we have to learn the definition of voltage?
Thank you!
This guy is my G
wait why do i kinda *enjoy* physics now :o
OUR HERO❤
How do the electrons carry the electrical energy? I don’t understand
Molly W
Electrons carry a charge of/ have a charge of -1
So theyre just carrying that -1 that they always have around a cell
Please could you make more Physics videos like motion, force , Newton's Law?
My mate👍💯💯
GOAT
if i get above a 7 in my physics mock tomorrow i will buy your merch
my mock is in a few hours so I'm here
do we get these work books in india?
You can buy them from Amazon, or if they're not available, then the ebooks are available from the website (freesciencelessons.co.uk).
physics test in 3hrs anyone hyped ?
2 years later how did it go
self teaching myself physics because my teacher is sht
0:54 carried*
This guy is cool
:)
how smart was he when he was a kid
thank you very much
It is volts not PD
No it's PD. It stands for potential difference.
he said it was easy
my brain: potato
potential difference
My teacher linked this but im in year 7/grade 6 wtf
thank you.
Is it mad that I’ve only just realised he’s Welsh 😂
I'm actually from Newcastle so I'm a Geordie.