OCR Physics Unit 2 - G482 - (June Exams Preparation)

Reply 280

so it goes

9

Original post by 07oakom

Can I be able to see it? :smile:

Sure, just send me your email and I'll add you :smile:

Reply 281

SmallMan

Original post by Dizzie31

could someone draw the answer for may 2009 1 (c) (i)
i'm really confused as it says potential divider input? do you need one :|

Yes because you need a change in source voltage, not just the voltage over the component. A variable resistor only gives you a change in PD over the component

Reply 282

JG1027

anyone do you know when it says find the power dissipated by heat how do you know whether to use the current voltage or resistance and what equation ? :frown:

Reply 283

_hail

Does anyone have a really simple clear explanation of stopping potential? My textbook is really confusing :/

Reply 284

_hail

Original post by Munrot07

Can someone just give me general tips on G482, i literally cannot revise it, its just hurting my head :frown:

Its so annoying, i find bio, chem and maths so easy but physics is just not happening :/ please, any help is welcome

Always check your units! They love giving you things in mm or kilo ohms and then seeing if you've noticed. Not having consistent units is a really easy way to lose marks :smile:

Um.. what else... 3 sf is usually safest, though look at what they've given you in the question to see how many sf to give your answer to. But if you're unsure 3sf is usually fine.
Learn the definitions because they're easy marks!
That's all I can think of right now, also diagrams really help, if you're stuck on a question draw a diagram of the situation if they haven't given you one and it might be clearer to you :smile:

Reply 285

ss2012

8

Original post by so it goes

Oh dear, I'm sorry. If you send your email address to me I can add you to the list of people who can see it :smile:

my email is [email protected]

Original post by Dizzie31

Requested access to see it :smile:

Original post by so it goes

I granted access (feeling very powerful) did it work? :smile:

I've got a problem with my google account and I've forgotten the password :frown:

would it be possible to post it as a word document on here?

thank you

Reply 286

Camellama

5

how many marks do you have to get for full ums?

Reply 287

OllieGCSEs

10

Original post by Camellama

how many marks do you have to get for full ums?

Usually around 89 I think

Posted from TSR Mobile

Reply 288

so it goes

9

Hey, I was just wondering how important it is to get the same number of significant figures as in the mark scheme. I often give mine to 3/4 sig. fig. Will I still get the marks if I'm too accurate? Or not accurate enough?

Reply 289

sophiekutie

11

Original post by so it goes

Hey, I was just wondering how important it is to get the same number of significant figures as in the mark scheme. I often give mine to 3/4 sig. fig. Will I still get the marks if I'm too accurate? Or not accurate enough?

Umm tbh I would try to stick to 2 unless it says SPECIFICALLY in the question otherwise.

Our teacher says they have been stressing it in the examiners reports for a while now and they REALLY dislike it if you do otherwise

Reply 290

sophiekutie

11

Can anyone help me with this...
Using the data above find the sum of the EMF's in the circuit...
The answer is 14-7.6 = 6.4
This is the emf of the charger - emf of battery
But I don't understand WHY they have done this? Can someone explain please x

Reply 291

sophiekutie

11

Original post by Dizzie31

could someone draw the answer for may 2009 1 (c) (i)
i'm really confused as it says potential divider input? do you need one :|

You either need a potential divider or a variable power supply because in the graph the voltage is changed from 0-6 volts
So you need one of these to be able to vary the voltage to the lamp :smile:

Reply 292

gavrilov

Original post by sophiekutie

Can anyone help me with this...
Using the data above find the sum of the EMF's in the circuit...
The answer is 14-7.6 = 6.4
This is the emf of the charger - emf of battery
But I don't understand WHY they have done this? Can someone explain please x

Hopefully this makes sense?

Reply 293

ReginaPhalange29

How many sf do you normally give answers? I stick to 3, unless the answer is exact.

Posted from TSR Mobile

Reply 294

SmallMan

Original post by ReginaPhalange29

How many sf do you normally give answers? I stick to 3, unless the answer is exact.

Posted from TSR Mobile

i always give it to three, unless in the question we have been given a value which is to two sf. Even if my answer is exact lol

Reply 295

sophiekutie

11

Original post by gavrilov

Hopefully this makes sense?

Ummmm... Not really? Haha

Is it because the batteries are not aligned (positive and negative)?

Reply 296

so it goes

9

Original post by sophiekutie

Umm tbh I would try to stick to 2 unless it says SPECIFICALLY in the question otherwise.

Our teacher says they have been stressing it in the examiners reports for a while now and they REALLY dislike it if you do otherwise