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AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread] Watch

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    Can people stop cheating on the EMPA or ISA? That's not what this thread was made for.


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    Hi Guys,
    I have been thinking about this question for a while now and I still haven't found an answer to it. Can anybody help me with it please?

    Can two capacitors discharge and charge simultaneously in a circuit? For example while one discharges the other charges? If so, can any body suggest an structure of the circuit?


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    (Original post by Mehrdad jafari)
    Hi Guys,
    I have been thinking about this question for a while now and I still haven't found an answer to it. Can anybody help me with it please?

    Can two capacitors discharge and charge simultaneously in a circuit? For example while one discharges the other charges? If so, can any body suggest an structure of the circuit?
    https://m.youtube.com/watch?v=884LWfnRDLY


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    Thank you, that was also helpful. In this case as one capacitor discharges the other charges until the potential difference across both capacitors is the same. I was wondering if one capacitor could discharge in a way that as it charges the other capacitor the final potential difference across the discharged capacitor would be less that the final potential difference across the charged capacitor, at the point which the charged capacitor starts to lose energy through the resistors and the wires, causing its potential difference to drop (after it reached its peak).
    Thank you


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    (Original post by Mehrdad jafari)
    Thank you, that was also helpful. In this case as one capacitor discharges the other charges until the potential difference across both capacitors is the same. I was wondering if one capacitor could discharge in a way that as it charges the other capacitor the final potential difference across the discharged capacitor would be less that the final potential difference across the charged capacitor, at the point which the charged capacitor starts to lose energy through the resistors and the wires, causing its potential difference to drop (after it reached its peak).
    Thank you


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    Sorry, I don't follow. Can you draw it out or something please?
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    (Original post by CD223)
    Sorry, I don't follow. Can you draw it out or something please?
    Oh sorry, of course.Name:  ImageUploadedByStudent Room1430644058.101797.jpg
Views: 104
Size:  140.5 KB


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    (Original post by Mehrdad jafari)
    Oh sorry, of course.Name:  ImageUploadedByStudent Room1430644058.101797.jpg
Views: 104
Size:  140.5 KB


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    I must say, I don't know the reason behind it producing that curve, but I think it's best we don't talk about it, for reasons I've already stated on this thread, so it doesn't get shut down.

    Thanks for your understanding.
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    (Original post by CD223)
    I must say, I don't know the reason behind it producing that curve, but I think it's best we don't talk about it, for reasons I've already stated on this thread, so it doesn't get shut down.

    Thanks for your understanding.
    Sure, and sorry for any inconvenience it may have caused


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    (Original post by Mehrdad jafari)
    Sure, and sorry for any inconvenience it may have caused


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    Don't worry about it! How's your revision going?
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    (Original post by CD223)
    Don't worry about it! How's your revision going?
    It's going ok, there is a lot to revise for. How's yours going?


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    (Original post by Mehrdad jafari)
    It's going ok, there is a lot to revise for. How's yours going?


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    Same. Struggling to prioritise haha!
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    (Original post by CD223)
    Same. Struggling to prioritise haha!
    True, we've got to sacrifice some


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    Anyone done PHY6T?
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    Understand that we're not supposed to talk about the ISA's but where's the best place to prepare for such?
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    Here you go guys, june 14 ISA as AQA is still reluctant to reveal them.make use of the teacher's notes
    ISA P june 14;
    Attached Images
  1. File Type: pdf AQA-PHY6T-P14-Task-Jun14.pdf (179.7 KB, 231 views)
  2. File Type: pdf AQA-PHY6T-P14-Test-Jun14.pdf (407.8 KB, 403 views)
  3. File Type: pdf AQA-PHY6T-P14-TN-Jun14 14.11.13.pdf (182.1 KB, 297 views)
  4. File Type: pdf AQA-PHY6T-P14-Final Marking Guidelines v2.pdf (318.7 KB, 464 views)
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    ISA Q june 14;
    Attached Images
  5. File Type: pdf AQA-PHY6T-Q14-Task-Jun14.pdf (88.8 KB, 454 views)
  6. File Type: pdf AQA-PHY6T-Q14-Test-Jun14.pdf (178.2 KB, 373 views)
  7. File Type: pdf AQA-PHY6T-Q14-TN-Jun14 8.11.13.pdf (94.0 KB, 220 views)
  8. File Type: pdf AQA-PHY6T-Q14-Final Marking Guidelines v1.pdf (110.9 KB, 241 views)
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    thanks, difference between P and Q?
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    (Original post by MichuAtDeGeaBa)
    thanks, difference between P and Q?
    No worries.
    I really don't know the systematic difference but i think they only differ in topics assessed


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    Can anyone go over what we need to know for motors and generators? The revision guide is incredibly brief.

    Also, when does back EMF apply?
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    Is there any chance an unofficial mark scheme will be posted after the deadline?
 
 
 
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