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Thread: HSC Physics 2018 Marathon

  1. #1
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    Thumbs up HSC Physics 2018 Marathon

    There's a thread for every other year so we should have one too! 3 Weeks till HSC lets get the questions going!!
    Please answer the question above before asking a new one and keep it within the scope of the syllabus!

    I'll start:

    Discuss the origins of unwanted heat production in transformers and ways in which these can be overcome (3 marks)
    2017

    Year 10: All other random subjects!!
    Prelim: Physics (Accelerated)
    HSC: Maths Extension 1(99), Maths Extension 2(94) (Accelerated)
    2018

    Prelim: English, Chemistry and Business
    HSC: Physics (Accelerated)
    2019

    HSC: English, Chemistry

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    Re: HSC Physics 2018 Marathon

    Quote Originally Posted by MinaSaw View Post
    There's a thread for every other year so we should have one too! 3 Weeks till HSC lets get the questions going!!
    Please answer the question above before asking a new one and keep it within the scope of the syllabus!

    I'll start:

    Discuss the origins of unwanted heat production in transformers and ways in which these can be overcome (3 marks)
    Transformers use an AC supply that is fed to a primary coil, as such it generates a change in flux in the rest of the transformer and the secondary coil. This can cause eddy currents to form in the Iron core. However these eddy currents can undergo a lot of friction within this core and thus waste unwanted heat energy. This can be minimized by laminating the Iron Core. Another unwanted heat production could be due to the resistance from the actual coils themselves which can be minimized by using superconducting coils or using less resistance coils.
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    Re: HSC Physics 2018 Marathon

    Good answer, I would explain maybe 1 more sentence on lamination. ie. The lamination of the iron core limits the size of each induced eddy current to one lamina thick, thus producing less heat.

    Ask a question!
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    2017

    Year 10: All other random subjects!!
    Prelim: Physics (Accelerated)
    HSC: Maths Extension 1(99), Maths Extension 2(94) (Accelerated)
    2018

    Prelim: English, Chemistry and Business
    HSC: Physics (Accelerated)
    2019

    HSC: English, Chemistry

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    Re: HSC Physics 2018 Marathon

    Quote Originally Posted by MinaSaw View Post
    Good answer, I would explain maybe 1 more sentence on lamination. ie. The lamination of the iron core limits the size of each induced eddy current to one lamina thick, thus producing less heat.

    Ask a question!
    I would not use the 'superconducting wires one', that is a bit meh tbh. I would also do another sentence about laminations -- referring to how they need to be laminated (perpendicular or parallel to something?) Also, you could include stuff on granular ferrites or powdered core transformers, alongside mentioning alloying the iron core with 3% Silicon.
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    Junior Member Drdusk's Avatar
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    Re: HSC Physics 2018 Marathon

    Quote Originally Posted by Fizzy_Cyst View Post
    I would not use the 'superconducting wires one', that is a bit meh tbh. I would also do another sentence about laminations -- referring to how they need to be laminated (perpendicular or parallel to something?) Also, you could include stuff on granular ferrites or powdered core transformers, alongside mentioning alloying the iron core with 3% Silicon.
    Just curious if I were to hypothetically write the Superconducting one in the HSC, would I lose a mark for it?
    Only reason I'm asking is because I remember in one past papers the sample answer said Superconducting wires, and it wasn't a dodgy paper either.

    Thanks.
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    ATAR aim: 95+(Achieved)

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    Re: HSC Physics 2018 Marathon

    Since the question only mentions unwanted heat production and you mentioned ohmic heating and superconducting to overcome it, I think that is fine since question does not address efficiency.

    Keep asking questions guys
    2017

    Year 10: All other random subjects!!
    Prelim: Physics (Accelerated)
    HSC: Maths Extension 1(99), Maths Extension 2(94) (Accelerated)
    2018

    Prelim: English, Chemistry and Business
    HSC: Physics (Accelerated)
    2019

    HSC: English, Chemistry

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