GCSE Physics Revision "Required Practical 4: Current / PD Characteristics"

[@222salena]

this man taught me more in a few minutes than teachers have in hours

[@glosza]

Real

[@azpect4664]

wallahi

[@malaika-kh]

the only person on youtube that i don't skip my ads for

[@agerar8094]

Helped a lot. Got my GCSE physics exam tomorrow so this should help me get a good score. Legend

[@lilskings8853]

How did it go

[@narrek6600]

I have it tomorrow as well

[@AA-wg8dl]

same now lol

[@oscarbradley7751]

@@lilskings8853 asked 6 months late

[@kp5659]

@@narrek6600 How was it

[@sarahzulk]

Got my exam today, helped me understand circuits etc more than my teacher in less time, always straight to the point. I used you for biology and I’m sure your videos gave me a few extra marks here and there! Thank you so much for all your hard work and trying your best.

[@owensaunders999]

This CURRENT video was really ELECTRIFIYING

[@og8929]

Owen Saunders haha

[@xx_1dreamstanlegend_xx422]

Why is this guy's face set as your profile picture?

[@Belacroix5]

Legend.

[@robertalbarda3266]

Please delete your KZbin account right now

[@samfour3762]

AMP up your jokes

[@blue2003_1]

I really like how he still replays to comments that is one year late. I find that really helpful

[@harvirr.7110]

no

[@darineali7820]

Hi, I just want to say that you're a godsend and everything you do is very greatly appreciated - thankyou!! :)

[@CozierStitches]

Thank you so much my will Power was really low before this Current video I really didn’t know Watt to do :)

[@jehneeshsethi6757]

🐜😂

[@mediarblx_npc]

Very funny

[@xaar0n426]

gcse physics 2023 tmrw, patterned all practicals in 30 mins, this mans my goat

[@nolimitdennis8730]

So much memorizing, my brain cant take dis anymore

[@yeahyeah190]

Relax don't panic

[@mohamedrizvimohamedshariff9082]

This man u are seeing is a person of a rare kind of teachers

[@caitlinmay8702]

im watching the ads as a thank you for helping me with my gcse (WHICH IS TODAY AH)

[@hayaalshadafan651]

I know this was a year ago but I hope u did well!!

[@m.s_2141]

This helps a lot for mock revision.

[@drcalvinlin28]

I get a very clear concept after seeing this video, I can teach my son.

[@SD-qb6ft]

aw

[@muhammad-zaynkalyan6051]

In the exam would we need to say about adding another resistor for the diode! Keep it up

[@EternalShadow1667]

Muhammad-Zayn Kalyan Its a possibility, god knows what they’ll ask.

[@brokenoob3797]

the diode info was amazing and the practical tysm. A 2 or 1 marker could be why there is an extra resistor in the diode circuit.

[@abuthebutcher9198]

2022 GCSE students watching these hoping they don't fail 😔

[@Squirp]

Real😞😞

[@UTB_]

👋

[@valkyrieme]

how did it feel to have exams b piss easy and low grade boundaries 🥲

[@赤いあ]

@@valkyrieme2023 gcse student here and I hope I won’t fail (also ur pfp love ur pfp love the manga )

[@Thrawnio]

Nice profile pic

[@kian2135]

You should be the wwe champion

[@henryovery2126]

No Just No

[@ZeroMirrorr]

Strong muscular guy: *Steps up. Glinting at such an unworthy opponent, Knows this will be an easy win for the championship* Freesciencelessons: *Looks him in the eye* So the resistance in your body is so large that you have no power for your arms to run, in fact your sluggish. The particles inside you are exploding and you really need a themistor implanted in your body because your overheating and... The guy: Just need a... *Runs out of the stadium*

[@poppyharris9961]

your fantastic- I've seen some great memes of u

[@promise.4162]

yeah ikr

[@Darth_Yoshi]

hi sir, just wondering would you need to describe how to set up the circuit for this and for the resistance practical?

[@hanawana]

Nice tie. Lookin' dapper.

[@emk7234]

Hi, thank you so much, just wondering do we need to know the circuit set up for each?

[@charizardb2029]

mr freesciencelessons is pluggin his merchhhh books for da future XD

[@missgirl7879]

Got my exam in 2hours, hope this has helped me score

[@mine-rb4hy]

this guy gave me a 9 thanks!!

[@lilskings8853]

Omg

[@belgaesalgreou719]

Big up mr freescience lessons , helped so much 🤝

[@LolMan-xg4op]

Yes broooo

[@aaronthomas2168]

In the exam, can you just draw the circuit to explain how it is set up?

[@Freesciencelessons]

Definitely. That's a good idea.

[@aaronthomas2168]

@@Freesciencelessons Thank you sir

[@1DROCKS12345]

Step one: set up apparatus as shown in the diagram This is my go-to move!

[@lighght]

​@@1DROCKS12345 that's very smart I'll definitely try that in my exam

[@sayanthan997]

1 hour before my test tysm

[@ilyasg6660]

Should I know how this works on a variable resistor, light-dependent resistor and thermistor

[@jax1296]

Can you explain why increasing the resistance using the variable resistor increases the potential difference? I thought as you increase the resistance the current decreases proportionally and the potential difference stays fixed as V = IR.

[@faragefan1014]

Because potential difference or voltage is equal to current multiplied by resistance, so to increase the resistance would increase the potential difference as long as the current stays the same, or constant. I think lmao 😂

[@MontyBleiker]

@@faragefan1014 Yes I agree, I think it is implied that the current would not be changed as the resistance increases, resulting in an overall increase in p.d.

[@ashantiaf4657]

Got my physics gcse tday

[@BlazeGaming1905]

Is this an extra video for topic 2?

[@Freesciencelessons]

Yes it is a required practical that I did not do a video for so I decided to do it.

[@theguys2402]

I thought yeh would need three of 'em to explain all this. made it all in one vid. really impressed. nd super helpful👍👍👍

[@durivian]

the best community :)

[@TheMinecraftGamerism]

can these practicals be in either paper 1 or 2? or are they specific to a certain paper?

[@nishagauchan4685]

PatrykGaming these practicals are for paper 1

[@mollysofie]

im so confused on why the voltmetre would change if it is only measuring across a resistor (and not the variable resistor) surely it wouldnt change. and adding onto that why is the volmetre across only one of the resistors that doesnt change and not across the battery.

[@ginar2330]

My exam is today and I still don't understand this 😭

[@sarahstubs3420]

Sorry to bug you... I was wondering why the current doesn't increase as soon as it is positive? Why does it have to be above 0.6V? Than you and sorry!

[@Freesciencelessons]

A diode contains a material called a semiconductor and it can only conduct electricity when the potential difference exceeds a threshold value which in this case is 0.6V

[@sarahstubs3420]

Thank you very much! That has been bugging me for a while:) The problem with GCSE's is that everything is slightly dumbed down so it leaves lots of loose ends! I keep having that problem with chemistry... hopefully A-Levels will be better :D

[@thericeguy9368]

uh, if you're doing physics a level now, what do you think of it?

[@ZeroMirrorr]

@@thericeguy9368 Physics a level is a lot more exciting than gcse physics. Note: Im still doing gcses but the topics look really fun for a level physics.

[@sf_0160]

Are we expected to work out the total resistance in a parallel circuit?

[@Freesciencelessons]

No you're not required to do that.

[@Name7.62]

I've heard that resistors are used to decrease current to a particular appliance, such as in the regulator of a fan. However, I've also heard that the total current in a circuit is always the same- in other words, all the current leaving the positive terminal of the battery reaches as it is to the negative terminal. How can this be? The two statements are contrary. How can the total current be the same if a resistor is reducing current at some point in the circuit?

[@alexireade3408]

Name 1 resistors don’t reduce current in the sense that they get rid of it, they just make a ‘bottle neck’, or smaller area for the current to pass through, like in a traffic jam, which causes it to slow down, lowing the current

[@AS-mw6pw]

Name 1 you’re thinking of the fact that current is always the same in series circuits. As in, wherever you measure the current from in a circuit at a given time, it will be the same. The total potential difference can not be changed by the resistance because the pd comes from the cell. The current is just the rate that the charge is flowing and so the resistance slows the rate down, thus decreasing the current. Pot.difference = Resistance x Current If the potential difference doesn’t change, and the resistance is increased, then the current has to decrease so it still equals the potential difference. Btw I’m still not 100% sure on the electricity topic so I may be wrong, but I hope what I said helps even if it is the night before the exam. Basically, what I’m saying is unless Shaun confirms what I’m saying, take all this with a pinch of salt as I may just be talking rubbish.

[@someone...000]

Great video as ever! But could u explain how varying the resistance of the variable resistor affects current and voltage? And also could u specify how we change the resistance on the variable resistor to increase increase current and voltage, decrease R or increase R?

[@milkbuns2543]

Not an expert, but increasing resistance decreases the current that can pass through the component and increases the PD or voltage needed to pass the current through the component. Guessing your exam is tomorrow like mine, so good luck :)

[@forre4290]

Sir when will you finish p2?

[@thesungkur1]

Sir, the electric current goes from the negative side of the cell to the positive side and in the video, the arrow in the diode is facing the opposing side of the electric current, so i dont understand why the diode isnt resisting the electric current

[@Freesciencelessons]

The arrow shows the conventional current which runs from positive to negative. If you watch my video on electric current (9-1) I explain what that means.

[@thesungkur1]

Thank you sir

[@MrNakedWizard]

New music, my man

[@Ann-qz2jx]

Sir This is a question I need help with. An appliance has a power of 2300W and has a current of 10.0A flowing through it. calculate the resistance of the appliance? So there wasn't an equation for this so I divided 2300 by 10.0 A which gave me 230 ohms . which was wrong, the correct one was 2300 divided by 10.0 by the power of 2= 23. But the part I don't get is why is the current in power of 2? please help me with this 🥺🙏🏼 if anyone knows why it is please feel free to say.

[@Freesciencelessons]

This video explains what you need to know: kzbin.info/www/bejne/goDce5d_aZaUebc

[@flameight7279]

the equation is power = resistance X current squared

[@HazardGoated]

There is a formula that is : P = I^2 × R. I hope that helps

[@sdafdsfsdaf]

i got 23 Ohms, I did power = current * voltage, then voltage = current * resistance equations

[@jethromaris624]

why do you need a variable resistor and why do you need to change the values

[@humayrakadir6621]

a variable resistor is used to change the resistance so u can get a range of values for current and potential difference. u need different values so u can plot a graph. u can search up this practical and watch an actual demo

[@astra2052]

the way he says current is so cute 😭

[@Draggie306]

Paper 2 exam tomorrow, wish me luck! Good luck everyone!!

[@mayo4931]

what did u get

[@kp5659]

if you have paper 2 test why u here this is paper 1 practical but it dont matter

[@TheKing-gw6ex]

Great vid sir thanks a lot really appreciate your efforts! If u don’t mind, how does the variable resistor vary the voltage across the component?

[@owenjones6869]

variable resistor allows you to increase length of the wire that the current is flowing through. the longer the wire, the larger the resistance as there is a longer path for the electrons to pass through so more energy is required to push them through. a larger resistance means potential difference must increase to push electrons round the circuit so the potential difference/voltage increases with resistance

[@asianaheed4040]

I'm learning this 10 minutes before school because of a test

[@lilskings8853]

How was it lol

[@loveen3186]

Sir, you know for the equipment, why must there be a variable resistor AND a resistor, whats the point/ need ???

[@Freesciencelessons]

The variable resistor allows us to change the potential difference across the component. However, a diode would be damaged by a high potential difference. So in the case of the diode, we have another resistor. This is to limit the size of the potential difference so the diode is not damaged.

[@loveen3186]

yes thanks, but what about for the first investigation, why was there any need to put a variable resistor? is it just simply to control the p.d?

[@taniyan7322]

Lil1 S yes it is. We use it to get different readings of p.d. for the graph

[@joshuacarroll12]

Lil1 S its so you can get a range of results on how p.d and current interact, the p.d is for the x axis on the graph of current against p.d, and since the current changes with change in p.d by changing the p.d it will allow you to plot a line on the graph (because you'll have a bunch of values, which form the x and y coordinates) - hope it helped, i'm awful at explaining 😂

[@emmajohnson6885]

Thank you for the videos. For the diode, you added an extra resistor to decrease the current but I thought the current was the same in all components in a series circuit?

[@bossbob1065]

saved paper 1 for me love man

[@reubenconstantine2685]

Is anyone else confused by the filament lamp? Says it gets hot as the current increases which increases the resistance. The graph shows the potential difference slows down, but wouldn’t it speed up with increased resistance since v = ir?

[@Freesciencelessons]

The potential difference is not "slowing down" or increasing more slowly. The current that you get for a given potential difference increases less as the resistance is higher (I = V / R).

[@reubenconstantine2685]

Freesciencelessons righhhhht thank you so much!

[@carter9847]

got my physics gcse in a few hours

[@nandoboiii5215]

This practical is so light lmaoooooooooooo

[@laptopuser4115]

why do you need a variable resisor?

[@joemaloney5956]

to be able to change the current in the circuit

[@jwhx4384]

It can be easier to change the resistance in the circuit more accurately

[@melissaaaaa4629]

Is this practical 100% only allowed to come up on the 1st physics exam?

[@melissaaaaa4629]

Or can it come up on the 2nd one too

[@Freesciencelessons]

It can only come up in the paper 1 exam as it's on the paper 1 section of the spec.

[@jagospiers7625]

Physics in 1 hour now

[@erina9129]

I could not find this video in the electricity playlist but i'm guessing this is for electricity

[@rayanpapayashayan38]

thank you

[@jamminermit]

Which playlist is this in?

[@Freesciencelessons]

This is in Electricity.

[@anonymousyouth7479]

Sir, why does the direction of the potential difference have no effect for the filament lamp even when the resistance is high? As with the diode, there is no current if the potential difference is reversed due to the high resistance. Why doesn't this happen for a filament lamp?

[@Freesciencelessons]

Because diodes are designed to have a huge resistance if the potential difference is reversed (diodes are a type of material called a semiconductor). A filament bulb is simply a thin wire so the current can easily flow in either direction.

[@anonymousyouth7479]

Thank you sir.

[@rushvi1611]

hello sir, i don't get why all the readings would be negative on the volt and ammeter if the batter is reversed

[@pratheesh2105]

the current is flowing in the opposite direction

[@claraburton8746]

king

[@itsagood1293]

hi why is a variable resistor used? Is it to change the p.d and if so why isn't this just done by changing the p.d of the battery?

[@Freesciencelessons]

You could change the pd by adding more cells to the battery. So that would be an acceptable alternative.

[@thalhachowdhury5209]

morning of my exam lets go

[@sophiexxx9783]

Cramming ✌️

[@aurora5395]

Waaaaaaaaaaaaaait.... I thought current was the same even if resistors were added 2:50

[@karlfernandes1367]

The resistor increases the resistance in the circuit which makes the current lower throughout the whole circuit I think

[@destiny-powerhouse3260]

Sir- i don't understand how the increase in temp in the filament lamp results in the graph looking like that- thanks

[@malvanoss5021]

because it just does

[@willgale2621]

The positive metal ions in the filament become hot and gain kinetic energy meaning they vibrate. Therefore if they’re vibrating it makes it more difficult for the electrons to pass through meaning the resistance increases resulting in the shape of the graph.

[@bloodless2320]

Big up everyone here for the 2022 physics exam tomorrow good luck 🤞

[@thex5483]

Is it not possible to instead of using a varibale resistor, to instead use a a power supply maybe that can change the amount of voltage and change the voltage by one volt maybe.

[@charliemorrison-jones3918]

Hi Ed

[@JackHolmesHJ]

2023 gcse anyone?

[@connorpower1453]

Amazing video that will definitely help me in my mock next week XD but why does the diode not allow any current when the pd is 0-0.6 volts??

[@Animalantics215]

Hi Charlie

[@GobaDoba-c1p]

what’s up ed

[@shrutiprajapati5576]

Can i get a 6 in foundation!

[@Freesciencelessons]

No, the highest grade in foundation is a 5.

[@shrutiprajapati5576]

Freesciencelessons even if get full marks?

[@shrutiprajapati5576]

Becuz for my course they need a 6

[@Freesciencelessons]

You'll need to speak to your teacher for your specific exam board but my understanding is that for AQA, the maximum level on foundation is a 5.

[@shrutiprajapati5576]

Freesciencelessons i spoke today she said that it depends if u get a 5. And 6 n evreything like tht than overal u will end uo getting 6 bt wen i asked on social media most of the comments were sying 5 is the highest.

[@annagabriellagroves2936]

why do we need to add a resistor in any of the circuits? please help anybody

[@Shyzzy-i5r]

i have not revised and my exam is tmrw

[@LolMan-xg4op]

Cheers for that mate

[@relipse6326]

Hi Sir, if you are supposing that the current flows like a conventional current, if it reaches the extra resistor detected by the ammeter, what is the point of having the variable resistor? Does it still lower the current even after the current is low??

[@Freesciencelessons]

The point of the variable resistor is to allow us to adjust the potential difference across the other component in the circuit (for example a fixed resistor, a filament lamp, a diode etc).

[@relipse6326]

@@Freesciencelessons Understood, thank you.

[@fazesway7014]

2023 students>>>>>>>>>>>>>>>

[@emmachandler8443]

Teehee physics tomorrow 😭

[@zachariasfrangou6853]

is it worth doing triple?

[@Freesciencelessons]

I think it depends on your ability and whether you enjoy science.

[@acebooth1862]

My school forces kids to do triple so guess I'll be needing this channel

[@BasantK4ndel]

Anyone here cause of HW due on 21st Friday??

[@tahreenakther2774]

I'm not sure why we are "adjusting" the variable resistor. If we want to see how a current flowing through a component changes as potential difference increases, why do we not just keep decreasing the variable resistor?

[@sagegames5818]

2023 lads goodluck

[@sweetiepiexxful]

👍👍

[@samredfearnmtb2773]

physics gcse at 1pm anyone ?

[@najis2594]

1hour and 30mins wish me luck

[@danielfattouh7788]

WHAT A HOTTIE

[@sob7168]

Right

[@darcykeane3827]

Marshallah

[@orange9107]

Anyone else watching two hours before the exam 🤣

[@High_on_Notes]

who else has got physics tomorrow

[@amygallagher9882]

Physics exam is in 45 minutes. I think I’m a bit last minute

[@guobaaa]

He is too cute

[@sob7168]

Agree

[@lighght]

😳

[@EditedByMichaelBowles]

Night before 2022

[@MaxGaming-mo9tn]

Anyone else see this in school

[@gabijames4408]

Hi

[@isabellek493]

😅

[@jamesrowley8902]

2019 squad