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

Dizzie31
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#541
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#541
good luck lads. prepare to be ..................
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abdurahmanali
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#542
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#542
Here is a summary of all the definitions you need to know http://www.flashcardmachine.com/ocr-physicsag482.html
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Jordn
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#543
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#543
(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
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Gcayte
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#544
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#544
What an awful exam!
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tdarren
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#545
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(Original post by Gcayte)
What an awful exam!
I agree

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JackLambourne
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#546
It could hae been much worse, but it was still awful. I think I may have scraped a C


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seajamiet
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#547
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#547
What did you guys get for efficiency, i got 80%
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tdarren
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#548
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#548
(Original post by seajamiet)
What did you guys get for efficiency, i got 80%
I got 78%

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hannahsm
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#549
(Original post by seajamiet)
What did you guys get for efficiency, i got 80%
I got 80% too!


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hannahsm
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#550
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#550
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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Gcayte
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#551
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#551
(Original post by seajamiet)
What did you guys get for efficiency, i got 80%
I got 80% too
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Mule
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#552
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#552
Damn that was so hard.
And that wave question...
I got 75%. :s
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Gcayte
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#553
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#553
I hated the speaker question with the receiver R
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
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Gcayte
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#554
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(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?
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hannahsm
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#555
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#555
(Original post by Gcayte)
What did you work R and total power to be?
I definitely got total as 3600 and I think R as 720?


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Gcayte
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(Original post by hannahsm)
I definitely got total as 3600 and I think R as 720?


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Yes I got that
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ErzaScarlet
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#557
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#557
Omg, that exam was actually so bad
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R4ch3l
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#558
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#558
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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3chainz
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#559
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#559
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:
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3chainz
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#560
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#560
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
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