GCSE Physics Revision "Resistance"
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- Опубліковано 31 тра 2024
- GCSE workbooks www.amazon.co.uk/Dr-Shaun-Don...
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In this video, we start looking at resistance. Students sometimes find the idea of resistance tricky at first so I'll take you through the basic ideas and then how to calculate resistance.
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
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*his blazer has left the chat*
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That's what I was thinking b4 I clicked on the video
Lol
I might fail
probably a really hot english day in that blue dungeon of his
Glad to see you're finally putting ads before your videos. I've been watching for weeks and only had my first ads today.
I'll never skip as you deserve the funding.
Does skipping the ad do that?
@@samuelbarrfitness yep
Wait, so the more of the ad we watch, the more money he gets?
@@Ikiguyy Apparently
Vishal Farma Nah. If we skip, he doesn’t get anything. If we watch the whole thing, he gets paid.
Petition to get this man a knighthood
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Yerman
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Love the tie, Sir
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Wavy
Damn my guy even put the shop and price. What a GGGGGGG
Same here never thought he would take that blazer off no homo btw don't take this the wrong way lol
@@Freesciencelessons sir2drippy
Thank you so much you don't understand how much you've helped me
Thanks for the comment. I love hearing from students who have found the videos helpful.
-I can now describe what is meant by resistance.
-I can now calculate resistance in a circuit.
You have almost singlehandedly saved my academic life, can't thank you enough for that
my teacher tells use that ohms law is a (V)ery (I)mportant (R)ule
ugh the cringe
josh Y-C at least it helps people to memorize
@@joshy-c5389 it's literally a physics mnemonic, come on now
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U got me a 9!!
Legend
what else did u do ? like past papers or what ?
@@jjcooks6002what did u get and what did u do?
Who’s here at 10pm watching this the day before an exam
midnight actually
me 💀 midnight
20:29 and a couple days before the exam
1am to be exact 😀
How did it go?
lol this is the only video without his blazer XD
momin naveed NO ITS NOT HOW DARE YOU
@@K_10107 its because no one can RESIST (☭ ͜ʖ ☭)
Lol
no
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My man looking fresh
got my exam on friday and these videos have really helped with my science revision, thanks!
tbh i wish they taught us this way earlier so i wouldn't have to cram all of this in a year.
I wanted to thank you for these videos you saved me from my exams
Free science lessons be getting me decent marks
Thanks❤️
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Your videos saved me in my biology mock today and I’m prepping for my physics tomorrow:)
Hope they went well for u and the other guy who replied to ur comment!
Thank you for these videos, they are really helping me with my science x
Have the test tomorrow. This helps so much, thank you 🙏
I've learnt more from these videos than 4 years of science lessons
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Thank You Free Science Lessons for supporting me I have Physics Tomorrow and I haven't prepared so thank you
4:22 made my day lol
Thank you for the video, you are clear and concise. From Britain
I cannot thank you anymore, I already did endless times :D
Right when I needed it! Science EOY exam in 2 days.
Vexo good luck
same m8
How did it go?
@@aurora-sk6rj bruh that was 3yrs ago
Same, eoy exam in a week
But how does resistance CAUSE the component to transfer energy? If the component transfers it itself?
I gave up tutoring science since his lessons are much better. 😁 I have been recommending his videos and workbooks to any student.
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Damn nice tie dude
Thank you. It was from TK Maxx.
thank you so much for your help you really make it easy to understand
i really cant thank you enogh you took me from damp level where i cant understand anything to a whole new level thanks sir ❤️
whoa Shaun looks clean without the blazer and that tie is nice
shaun?
hi sir, would the brightness of the bulb vary with the resistance? thank you for everything :)
Your videos help a lot thank you :)
If energy is lost in the wire then shouldn’t the voltage be less when it reaches the component
I wonder do you have a video on resistance in a wire?
Is it possible to get a grade 9 without doing past paper questions? I feel like I've left it too late because I have only just started revising and so I won't get time to do past papers.
great videos big man
His voice is so satisfying to learn from LOOL
watching this the morning of paper 2!
Please can we get this man a Nobel prize
thanks for your help.
how can we support this channel, its just so great!
Watch the ads!
seeing freesciencelessons without a blazer is like finding an easter egg lol, also thanks for the vid
Can you watch his videos if you do IGCSE instead of GCSE?
IGCSE is international, I think GCSE is for Uk
@@happicorgo4138 that defo answered his question didnt it, not like he knew that
Yeah, our syllabuses are practically the same
bro carryed my life
thank you free science lessons
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sooooo, if a lamp has a higher resistance, will it be dimmer or brighter. I don't get this at all
how does he explain something I didn't understand at all in my class in under 5 minutes??
Thanks for helping me with my homework
So the lower the resistance the lower the potential difference?
You are the best
Hi, do you have any videos on ohmic conductors because I can’t find any. But in my textbook it has info on them
Thanks :)
Yes you need the video called "Resistors".
@@Freesciencelessons ok thank you so much for replying :)
Sir, please reply. I want to know, can resistance change the amount of current or does it only change potential difference? Since in some components like a diode, current can’t flow through in a certain direction, so it would be 0A (I think) but I thought that current remains the same throughout a series circuit. I’m confused.
Those are two questions really. Firstly the diode. A diode will stop current flow if it's in the wrong direction so in that case there will be no current. In the case of the resistance, you need to look at the equation R = V / I. If we increase the resistance (but keep the current the same), then potential difference must increase. If we increase the resistance but keep the potential difference the same, then the current must decrease.
@@Freesciencelessons so the current decreases throughout the whole circuit?
The current will decrease throughout the whole circuit.
cheers geoff
Hi sir, at 2:12 will lamp B be brighter than lamp A, as more electrical energy is being transferred per coulomb of charge into light and thermal energy, so resistance makes a bulb brighter?
2. I'm a bit confused about the definition of resistance. Can I think of it as the amount of energy required to push the electrons through the vibrating atoms?
If you could please take the time to answer my questions, I would be happy because this is a part of physics I don't understand.
1. Yes (although it does depend on the type of bulb).
2. Think of resistance as the potential difference required to take a certain current through a component.
@@Freesciencelessons Thank you for clearing that up, with the help of your videos I definitely feel much more confident with electricity. (&Science in general tbh)
that damn smile...
day before exam for me....like always
physics paper 1 tomorrow. yay.
thank you sir
My guy is looking fresh.
so could you say that resistance is directly proportional to potential difference and inversely proportional to current?
Yes that's correct for a fixed resistor at constant temperature.
@@Freesciencelessons okay, thank you so much for replying
Thank you sir but I didn’t really get the definition of resistance
Sir, in some of the videos on this topic you said we won’t be given the equations on the exam. Is that still true for 2024 exams? It’s cuz i had a mock and we were given all the equations.
You are given all the equations in 2024
@@Freesciencelessonsthanks
Atlast the legend removes his blazer
Hi Sir 🇨🇭 I have a really important question: what do you mean by “ the resistance tells us the potential difference required to drive a current through a circuit”. Doesn’t resistance slow down an electric current? I am struggling to understand this so please could you answer these questions sir as soon as possible sir as I have physics gcse exam next week. Ty ♥️
Resistance is the potential difference required to drive a current through a circuit. We can see that from the equation R = V / I. That's essentially the definition of resistance. For example, if a potential difference of 100V drives a current of 10A, then the resistance is 100 / 10 = 10 ohms. A current will only pass through a circuit if there's a potential difference. If you apply the same pd to two circuits, then the circuit with the lower resistance will have a greater current.
You can think of it in terms of how easy it is for the current to flow (although this is not really a scientific concept, so it's just for simplicity sake and should not be used in an exam). For example, if a wire has a low resistance then that means that it's "easier" for the current to pass through. Therefore it will take less pd to drive that current, compared to a wire with a greater resistance (which is "harder" to drive a current through). I hope that helps.
You said that the current is a flow of electrons but then why is the current flowing from posotive to negative,shouldn’t it be negative to the posotive terminal
Hi. In my videos (and the spec), we use the conventional current which runs from positive to negative. Originally scientists thought that current was a flow of positive charge and the idea just stuck.
please put the link to the revision boos into the comment section many thanks
This really helped me
Sir, can I say that in a battery, the cell that is in the wrong direction, has a negative potential difference (e.g. a p.d. of -9V)?
I apologise for the these questions that may waste your free time . I am truly sorry
jaffry jaman he said he uses conventional current
do we consider the resistance 0 at the connecting wires?
if you consider resistance as zero then the equation becomes V=I(0),so I think the resistance would be one
@@MoinKhan-wv5qw at igcse we do ignore it
i love u omg
whos ready for 2020 GCSEs YAYYY
not me im gonna fail
Lmao corona time
This aged poorly XD
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i like it
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I dont get what resistance means
Hi 🇨🇭 it’s me again of you can could you please answer my question as I need some clarification to this topic in order for my physics exam next week
Excuse me sir, I've been asked for my homework to calculate the potential difference across the resistor but I've been gives the ammeter reading of 0.2 A (in a series circuit) and a cell of 3 volts. What am I meant to do? I'm confused.
How many resistors are in the circuit?
@@Freesciencelessons just one
I think I'd really need to see a diagram to get an idea of the whole circuit I'm afraid. I'm sorry about that.
You just saved my ass from a test
can i learn all of gcse science just by watching your videos
where did your blazer go
To detention
i'm surprised to see him without a blazer
shaun = main man
Shouldn’t lamp b have less current because more resistance?
If the potential difference was the same across resistors A and B, then the bulb in B would have 1/10th the current that bulb A has, since bulb B has 10x the resistance of bulb A. However, since bulb B has 10x the potential difference as bulb A, the current will be the same in both bulbs.
New day new tie
Sir I have my physics and English literature mock tomorrow I am scared. Help I haven't revised 🥺
Rewatch all of these videos multiple times, got me from 5s to 8s
@@fireemperorzuko8756 thanks mate
funny how it takes a week to learn in class but 3-4 minutes on youtube