Saturday, 30 March 2013

2.7 understand the difference between mains electricity being alternating current (a.c.) and direct current (d.c.) being supplied by a cell or battery

Direct current flows in one direction only. It is supplied by cells and batteries. It comes out as a straight line on an oscilloscope.

Alternating current changes from one direction to another rapidly. Mains electricity is alternating (interestingly this is because the electricity has to go through transformers on the national grid which only work on ac current, although that's not relevant here!)
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8 comments:

  1. Unknown18 March 2015 at 14:04

    I just wanted to say thank you for all your help x you have made me get an A when all my teachers predicted me a C x I hope you keep helping people and make people achieve the best they can achieve x
    Thank you again
    Frankie

    ReplyDelete
    Replies
    1. Unknown10 February 2016 at 10:06

      Did you use this to revise on it own with past papers or did you use a text book also

      Delete
    2. Joao13 April 2017 at 09:35

      I just used some of Hannah Help and I got an A*A in my Mocks

      Delete
  2. Joao13 April 2017 at 09:39

    Very helpful website:
    http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/electricity/mainselectrev5.shtml

    ReplyDelete
  3. Anonymous18 May 2018 at 04:41

    thank you so much for all this hope i get an A

    ReplyDelete
  4. smelly peen ツ28 May 2018 at 10:47

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    ReplyDelete
  5. Unknown5 December 2018 at 04:06

    bitch

    ReplyDelete
  6. Unknown5 May 2019 at 00:58

    cheers

    ReplyDelete

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