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# Physics P3 watch

1. My teacher said to focus revision on the topics which didn't come up. I think that would be:
The electric motor
The generator
Satellites
The birth and death of a star
Circular motion
Diagrams for concave/convex mirrors
Refraction
Magnification

That's just a guess though.
2. (Original post by trance addict)
it was a decentish paper.. you just had to remember al ot of the facts from the book, some of the questions were really stupid though (typical aqa though eh?)
I thought it was bloody difficult. I bet this one is going to be even harder.
3. There isn't any question worth 7 marks. I thought the max was 5 but that was until i did the bio paper last last week - it had 6 marks question.

Anyway the answer to your question is because for a coil to keep rotating in one direction, the current has to be reversed, thus the current used is A.C. The brush is a conductor attached with the slip ring which is also a conductor and is connected to the coil. The brush is connected to circuit, thus the force produced by the rotation of the coil forces the electrons in the circuit to move, thus creating an A.C. generator (a flow of electrons).

Hope it helps
4. (Original post by piece_by_piece)
Yeah, they have given you the formula for the transformer question, and that was the only calculation on the paper. If you have a browse through the specification, you'll find the only formulas you need to know how to manipulate are the magnification one and this transformer one.
Magnification= Image height/Object height
Transformer one= Vp/Vs=Np/Ns
Thanks phew....have you looked at that website...antonine-eduation....should i just ignore it? x
5. Ahh, no wonder. This thread is about P3 AQA and I'm doing edexcel360 !
6. (Original post by indie_couture)
Thanks phew....have you looked at that website...antonine-eduation....should i just ignore it? x
I've looked at it. It seems to be a bit more in depth than we need. I'd just focus on the things in the Nelson Thornes textbook if you have it? That's what I'm doing.
7. (Original post by piece_by_piece)
I've looked at it. It seems to be a bit more in depth than we need. I'd just focus on the things in the Nelson Thornes textbook if you have it? That's what I'm doing.
Ok ...im going to go and do some now! o how was textiles? xxxxxxxx
8. (Original post by indie_couture)
Ok ...im going to go and do some now! o how was textiles? xxxxxxxx
I don't do textiles!
9. My Physics teacher rang up AQA (our school's pretty weird, they seem to call up the exam boards to enquire/complain at any given chance) and they said from now on you will always be given the formulae. =)
Actually it kinda annoyed me because I'd had to learn it all for P2 but ah well.
Ooh I really don't like generators =/
Good Luck everyone! =) x
10. (Original post by Mighty Grandiose Noble Knight)
There isn't any question worth 7 marks. I thought the max was 5 but that was until i did the bio paper last last week - it had 6 marks question.

Anyway the answer to your question is because for a coil to keep rotating in one direction, the current has to be reversed, thus the current used is A.C. The brush is a conductor attached with the slip ring which is also a conductor and is connected to the coil. The brush is connected to circuit, thus the force produced by the rotation of the coil forces the electrons in the circuit to move, thus creating an A.C. generator (a flow of electrons).

Hope it helps
Thank you! I will remember to rep you tomorrow
11. (Original post by piece_by_piece)
I don't do textiles!
o i thought you'd made a post the other day about the exam!
sorry..... x
12. (Original post by indie_couture)
o i thought you'd made a post the other day about the exam!
sorry..... x
Haha, it's fine no worries!
13. (Original post by piece_by_piece)
I've looked at it. It seems to be a bit more in depth than we need. I'd just focus on the things in the Nelson Thornes textbook if you have it? That's what I'm doing.
Okay thanks for the information - if you compare the paper to the text book - does it contain everything you need to know though?
14. (Original post by KnightRider)
Okay thanks for the information - if you compare the paper to the text book - does it contain everything you need to know though?
I'd say no, but I'm biased. I hate Physics, and don't understand it. It did contain most things, but there was a question "Explain the advantages of having a National grid system", and I don't think the book explains that. Also the questions, with reference to a transformer: "Why is insulated wire, and not uninsulated wire, used to make the coils?" and "Why is the core made of iron?" aren't explained the textbook. Apart from those 3 questions (worth 4 marks altogether) the rest is explained in the textbook.
15. (Original post by piece_by_piece)
I'd say no, but I'm biased. I hate Physics, and don't understand it. It did contain most things, but there was a question "Explain the advantages of having a National grid system", and I don't think the book explains that. Also the questions, with reference to a transformer: "Why is insulated wire, and not uninsulated wire, used to make the coils?" and "Why is the core made of iron?" aren't explained the textbook. Apart from those 3 questions (worth 4 marks altogether) the rest is explained in the textbook.
why dont you understand it ?

1. national grid system allows power to be drawn from anywhere
2. insulated wire is used because the coil is made of conductive metal, and we don't want it to conduct the induced current
3. the core is made of iron because it is a conductive material
16. (Original post by piece_by_piece)
I'd say no, but I'm biased. I hate Physics, and don't understand it. It did contain most things, but there was a question "Explain the advantages of having a National grid system", and I don't think the book explains that. Also the questions, with reference to a transformer: "Why is insulated wire, and not uninsulated wire, used to make the coils?" and "Why is the core made of iron?" aren't explained the textbook. Apart from those 3 questions (worth 4 marks altogether) the rest is explained in the textbook.
Well if it's not in the specification too I don't see how they can ask!

Ahhh I'm scared for this exam now - haven't actually started revision yet, meant to do unit 2 first!
17. (Original post by trance addict)
why dont you understand it ?

1. national grid system allows power to be drawn from anywhere
2. insulated wire is used because the coil is made of conductive metal, and we don't want it to conduct the induced current
3. the core is made of iron because it is a conductive material
The last two are wrong.
18. (Original post by piece_by_piece)
The last two are wrong.
oops, 3rd one is magnetic*

2nd answer was a bit waffily too, in the test i wrote "so the coil does not conduct any electricity"
19. (Original post by piece_by_piece)
Thank you! I will remember to rep you tomorrow
Your welcome and thank you too. If there is any doubts on any Science or Math question than ask me
20. (Original post by trance addict)
why dont you understand it ?

1. national grid system allows power to be drawn from anywhere
2. insulated wire is used because the coil is made of conductive metal, and we don't want it to conduct the induced current
3. the core is made of iron because it is a conductive material
Nope. advantage of national grid system is because it is very efficient since the voltage is very high and the current is significantly low. Heat produced is less so there is less waste energy. Thus, less power cuts etc

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