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

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Reply 540

Dizzie31

good luck lads. prepare to be ..................

Reply 541

abdurahmanali

Here is a summary of all the definitions you need to know http://www.flashcardmachine.com/ocr-physicsag482.html

Reply 542

Jordn

Original post by Legal drugdealer

A ‘flat’ car battery of internal resistance 0.06 Ω is to be charged using a battery charger having
an e.m.f. of 14 V and internal resistance of 0.74 Ω, as shown in Fig. 2.1.

You can see that the battery to be charged has its positive terminal connected to the positive
terminal of the battery charger.
At the beginning of the charging process, the e.m.f. of the ‘flat’ car battery is 7.6 V.
(i) For the circuit of Fig. 2.1, determine

Why do you take away the emf to find the total emf?

On the diagram its -14 + 7.6
Witch is in effect 14-7.6

Reply 543

Gcayte

What an awful exam! :frown:

Reply 544

tdarren

Original post by Gcayte

What an awful exam! :frown:

I agree

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Reply 545

JackLambourne

It could hae been much worse, but it was still awful. I think I may have scraped a C

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Reply 546

seajamiet

What did you guys get for efficiency, i got 80%

Reply 547

tdarren

Original post by seajamiet

What did you guys get for efficiency, i got 80%

I got 78%

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Reply 548

hannahsm

Original post by seajamiet

What did you guys get for efficiency, i got 80%

I got 80% too!

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Reply 549

hannahsm

That wasn't too bad, but I swear there will always be questions that I can't figure out on these papers...

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Reply 550

Gcayte

Original post by seajamiet

What did you guys get for efficiency, i got 80%

I got 80% too :smile:

Reply 551

Mule

Damn that was so hard.
And that wave question...
I got 75%. :s

Reply 552

Gcayte

I hated the speaker question with the receiver R :frown:

There was lots of 3/4 marks where I could only think of 2 points :/
The only thing I liked were the show that so and so equals this :redface:

Reply 553

Gcayte

Original post by Mule

Damn that was so hard.
And that wave question...
I got 75%. :s

What did you work R and total power to be? :smile:

Reply 554

hannahsm

Original post by Gcayte

What did you work R and total power to be? :smile:

I definitely got total as 3600 and I think R as 720?

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Reply 555

Gcayte

Original post by hannahsm

I definitely got total as 3600 and I think R as 720?

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Yes I got that :biggrin:

Reply 556

ErzaScarlet

Omg, that exam was actually so bad :frown:

Reply 557

R4ch3l

Absolutely h a t e d that paper. Hope the grade boundaries are low! Didn't know how to do the one where the battery takes 7 hours to recharge. How did you guys do it?

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Reply 558

3chainz

yeah i got 3600 and 720 too.

What did everyone put for the receiver R thing when it's moved by 0.75 cm?

I remember saying that they have an odd number of wavelength (quarter of wavelength) and so destructive interference etc etc..

did everyone write that? :confused:

Reply 559

3chainz

umm its Q= I xT

where your I is 120A and Q was worked out in the first part of the question, so you'll get your answers in seconds, so you divide your answer by 3600 :smile: