Hello, I would like to first off say thank you for making these videos. They made me achieve 999 in the triple sciences in the mocks in year 10. Say if I ONLY learnt all content on your videos purely for my revision (as well as using past paper questions closer to the exam date), will I bet set for getting 999 in the triple sciences? Do your vids cover the whole AQA GCSE spec point by point? Thanks
Hello, I was wondering why it is that there is a slight delay once the pd is positive before current starts to increase? Thank you so much for your time and effort:)
obviously its too late and you already done your gcse, but its because the diode is made from silicon which is a semi conductor material so it needs some energy (potential difference) it can start moving electrons freely so at 0v to 0.6v, there will be no current as no electrons are free to move, but after 0.6v, the electrons can move so it rapidly increases
Sir, at 1:43 in the circuit, the current is flowing from the postive end of the cell to the negative. Shouldnt it go from the negative end of the cell to the postive. Thank You.
No, in physics we always draw the current going from positive to negative. It's called the conventional current and it's a relic from the early days of Physics. I explain it here: www.freesciencelessons.co.uk/gcse-physics-paper-1/electricity-old/current-in-series-circuits/
Sir. I'm a little confused. I thought the conventional current was opposite to the way that electrons flow, so in the animation, why do you show the electrons flowing in the conventional current instead of electric current (the correct direction?). Am I also right to believe that, once a certain pd has been reached for diodes, that the increase is at a constant rate (because it is a straight line?)
Conventional current is a relic of physics past, where scientists thought that charge carriers were positive. We now know that electrons are negative but we still use the idea of conventional current (for various reasons). So in my videos, I show the electrons as if they were causing the conventional current even though this is incorrect.
Conventional Current Direction flows from positive to negative. Electrons flow in the opposite direction, negative to positive. Scientists discovered conventional current direction in the 1800s, which was way before the discovery of the flow of electrons. So, once scientists discovered the flow of electrons, they realized conventional current direction is the opposite. But, if we followed electrons flow (- to +), then scientists would have to recreate many electric equations, concepts, etc. So, they followed conventional current direction. Mathematically speaking, it is isn't wrong, as a transfer of positive charge is equal to a transfer of negative charge in the opposite direction. I hope you understand!
But why is it that for a diode, the graph for forward current flow does not begin at 0 but instead begins to increase a distance after which some potential difference has been applied?
Radreon X Probably because the resistance is still too high at this point, so you need to apply a little bit more volts to have a current flowing properly. OR The diode is made specifically to only allow the current to pass once there is a certain amount of potential difference across it. Those are my guesses; I have to ask my teacher before the test tomorrow 😓
can someone please explain conventional current and why the current is flowing in that direction in the video - I know conventional current flows in the opposite direction but I just don't know why it's flowing that way in the video. Thank youu
When scientists first explored electricity, they thought that electrical current was carried by positive particles. They thought that these moved from the positive pole of a cell to the negative pole. A lot of the conventions of electricity were then developed based on this (for example Flemings Left and Right hand rules). Later, scientists realised that electrical current is actually carried by negative particles, moving from the negative pole to the positive pole. But because their earlier model was so useful, they kept it even though they knew it was wrong. This is now called the conventional current. In all of my electricity videos, I show the conventional current. I hope that answers your question.
In my videos yes. In textbooks, the conventional current should be used but just remember that conventional current runs from positive to negative so you can always tell.
Conventional Current Direction flows from positive to negative. Electrons flow in the opposite direction, negative to positive. Scientists discovered conventional current direction in the 1800s, which was way before the discovery of the flow of electrons. So, once scientists discovered the flow of electrons, they realized conventional current direction is the opposite. But, if we followed electrons flow (- to +), then scientists would have to recreate many electric equations, concepts, etc. So, they followed conventional current direction. Mathematically speaking, it is isn't wrong, as a transfer of positive charge is equal to a transfer of negative charge in the opposite direction. I hope you understand!
At 1:29 , underneath the conventional current arrow, the green arrow is pointing left, but since the conventional current arrow is supposed to face the opposite direction to the one that the current is travelling in, would the green arrow not face the other way, since in the diagram it’s going from positive to negative? I could be wrong
@@user-ld1lg4dz2o how it's shown in the video is right, the conventional current is assumed to come out of the positive end of the cell and as shown in the video it is, and even though we now know that's wrong we still draw it this way.
@@yujirohanma203 what they said, and because scientists used to draw it this way before it was discovered it was wrong, however it’s still drawn wrong just for the sake of drawing
Hi i was wondering what the point of a diode is because why would charge try to flow in the opposite direction? ( Back to the negative terminal of the battery)
The Diode Faces In the direction of the “Conventional Current” in your diagram Mr. Vaguely Welshman, that better be right, because I’m damn sure current flows from negative to positive...
OK, don't sweat it. Watch something else instead. Electricity is a hard topic. Go back to it and try to just watch a couple of videos when you're up to it.
One hr before the exam
One night before the exam 👍🏽
3 months before exam 😜
40 minutes before the exam
It's almost 1:30 am, and I have an exam today at 3 pm, I know I'm going to fail it, but I'm just going to try my best XD
3 days before the exam✈️💃
what a legend this lad right here explained a concept i was taught in class that i did not understand for atleast a few months (until now atleast)
I’m finding this topic very difficult but this really helped with my homework, thank you!
be better
@@WillScott9455😂🤫🧏🏼♂️
Hello, I would like to first off say thank you for making these videos. They made me achieve 999 in the triple sciences in the mocks in year 10.
Say if I ONLY learnt all content on your videos purely for my revision (as well as using past paper questions closer to the exam date), will I bet set for getting 999 in the triple sciences? Do your vids cover the whole AQA GCSE spec point by point? Thanks
Hi, did you end up doing this?
you're a life saver!!!!
Hello, I was wondering why it is that there is a slight delay once the pd is positive before current starts to increase? Thank you so much for your time and effort:)
Sarah Cat because of the resistance in the circuit
obviously its too late and you already done your gcse, but its because the diode is made from silicon which is a semi conductor material so it needs some energy (potential difference) it can start moving electrons freely so at 0v to 0.6v, there will be no current as no electrons are free to move, but after 0.6v, the electrons can move so it rapidly increases
Sir, at 1:43 in the circuit, the current is flowing from the postive end of the cell to the negative. Shouldnt it go from the negative end of the cell to the postive. Thank You.
No, in physics we always draw the current going from positive to negative. It's called the conventional current and it's a relic from the early days of Physics. I explain it here: www.freesciencelessons.co.uk/gcse-physics-paper-1/electricity-old/current-in-series-circuits/
got destroyed by the man himself
How likely is this topic to come up in an exam?
I would say quite likely. It's on the spec so it could come up.
literally never understood this before thanks so much
Thank you for the video, very informative and well explained, from Britain
Sir. I'm a little confused. I thought the conventional current was opposite to the way that electrons flow, so in the animation, why do you show the electrons flowing in the conventional current instead of electric current (the correct direction?). Am I also right to believe that, once a certain pd has been reached for diodes, that the increase is at a constant rate (because it is a straight line?)
Conventional current is a relic of physics past, where scientists thought that charge carriers were positive. We now know that electrons are negative but we still use the idea of conventional current (for various reasons). So in my videos, I show the electrons as if they were causing the conventional current even though this is incorrect.
Conventional Current Direction flows from positive to negative.
Electrons flow in the opposite direction, negative to positive.
Scientists discovered conventional current direction in the 1800s, which was way before the discovery of the flow of electrons. So, once scientists discovered the flow of electrons, they realized conventional current direction is the opposite. But, if we followed electrons flow (- to +), then scientists would have to recreate many electric equations, concepts, etc. So, they followed conventional current direction. Mathematically speaking, it is isn't wrong, as a transfer of positive charge is equal to a transfer of negative charge in the opposite direction.
I hope you understand!
THANK YOU .
this was really helpful and interesting as well to learn
But why is it that for a diode, the graph for forward current flow does not begin at 0 but instead begins to increase a distance after which some potential difference has been applied?
Radreon X Probably because the resistance is still too high at this point, so you need to apply a little bit more volts to have a current flowing properly.
OR
The diode is made specifically to only allow the current to pass once there is a certain amount of potential difference across it.
Those are my guesses; I have to ask my teacher before the test tomorrow 😓
hello, why is there a delay before the current through a diode starts to rise once the p.d. is positive? many thanks
so is an led essentially a mixture if a bulb and a diode? thanks so much for the videos we really appreciate you!
An LED is a diode that emits light. Apart from that, LEDs don't have much in common with a lamp. They operate by different processes.
When is your workbook going to be completed??
can someone please explain conventional current and why the current is flowing in that direction in the video - I know conventional current flows in the opposite direction but I just don't know why it's flowing that way in the video. Thank youu
When scientists first explored electricity, they thought that electrical current was carried by positive particles. They thought that these moved from the positive pole of a cell to the negative pole. A lot of the conventions of electricity were then developed based on this (for example Flemings Left and Right hand rules). Later, scientists realised that electrical current is actually carried by negative particles, moving from the negative pole to the positive pole. But because their earlier model was so useful, they kept it even though they knew it was wrong. This is now called the conventional current. In all of my electricity videos, I show the conventional current. I hope that answers your question.
@@Freesciencelessons thank you so much, does that mean that in all the diagrams I'll come across, conventional current would be used?
In my videos yes. In textbooks, the conventional current should be used but just remember that conventional current runs from positive to negative so you can always tell.
Conventional Current Direction flows from positive to negative.
Electrons flow in the opposite direction, negative to positive.
Scientists discovered conventional current direction in the 1800s, which was way before the discovery of the flow of electrons. So, once scientists discovered the flow of electrons, they realized conventional current direction is the opposite. But, if we followed electrons flow (- to +), then scientists would have to recreate many electric equations, concepts, etc. So, they followed conventional current direction. Mathematically speaking, it is isn't wrong, as a transfer of positive charge is equal to a transfer of negative charge in the opposite direction.
I hope you understand!
At 1:29 , underneath the conventional current arrow, the green arrow is pointing left, but since the conventional current arrow is supposed to face the opposite direction to the one that the current is travelling in, would the green arrow not face the other way, since in the diagram it’s going from positive to negative? I could be wrong
Or are the green arrows supposed to be like the conventional current, where they are facing the wrong way?
@@user-ld1lg4dz2o how it's shown in the video is right, the conventional current is assumed to come out of the positive end of the cell and as shown in the video it is, and even though we now know that's wrong we still draw it this way.
@@yujirohanma203 what they said, and because scientists used to draw it this way before it was discovered it was wrong, however it’s still drawn wrong just for the sake of drawing
Why do the current increase on the filament lamp if the resistance increases?
I screamed when he said "One direction" , i really need to get a life
you really should
yikes
it's been three years, eleanor. sheesh.
OMG SAME
Yes you definitely should
Eleanor i’ve just got into One Direction over lockdown, I probably need to get a life too
Sir ,can i know where i can get questions because even though i click the link i cant find questions, please?
Cramming for physics p2 tomorrow 🤣
this is paper 1 lmao? well nvm im a bit late
@@GastricIssuesFartman haha
Hi sir just wanted to know if you need to know everything in the video for exams or just the bullet points you mention at start
You need to learn everything in the video.
Hi i was wondering what the point of a diode is because why would charge try to flow in the opposite direction? ( Back to the negative terminal of the battery)
I’m really not understanding resistance. What’s the effect of a high resistance as opposed to a lower resistance in a circuit?
Think Ohm's law, more resistance means more voltage and less current.
The Diode Faces In the direction of the “Conventional Current” in your diagram Mr. Vaguely Welshman, that better be right, because I’m damn sure current flows from negative to positive...
Convectional current goes from positive to negative
damn bro, so much passive aggressiveness
have you got an email, i can ask you some stuff? Only if you don't mind
you are the best
What is the purpose of a diode?
It only allows the current to flow in one direction which is very useful if you don't want it flowing in the wrong direction
118 days before May/June o level exam 2021
Who are the 18 people who disliked this video i stg
listen to him say "diode" on 1.5x speed :)
It's mesmerising
i subscribed
well done
I have mocks in 6 days 😖
hows mocks going? good luck
good luck for august!
I need sleep
I'm gonna pass out loool
Same man im watching this at 10.34pm i need to go sleep but i also have mock exam test tomorrow😴😴😴
Thanks it’s 5am 😭
Half an hr before the exam 😂
He’s giving me sheldon vibes from the big bang theory😂😬
2 hours before my exam
haha one direction Lmao
hello
hi!
hii
I hate this playlist I just don't understand so many parts even if I watch them multiple times.
OK, don't sweat it. Watch something else instead. Electricity is a hard topic. Go back to it and try to just watch a couple of videos when you're up to it.
Freesciencelessons ok
Remember that he's trying his best to help us understand, i'm sure if you just keep calm and relax a little you'll get small bits of it!
how you feeling about tomorrow